LAURITZ KNUDSEN / ELECTRICAL & AUTOMATION
Motor protection relays
Protection and monitoring options for motor circuits.
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01
Thermal overload relays
02
REO electronic overload
03
eMPR protection
04
iMMR intelligent motor management
MANUFACTURER REFERENCE / August 2026
Details, down to
the catalog number.
Browse the supplied specification pages. Published MRP is a dated manufacturer reference; request a current Nova quote and confirm the tax basis and pack size.
ESP Lauritz Knudsen Price List (1).pdf ↗ · PDF pages 19–27
9 catalog pages
PDF page 19 Thermal Overload Relays [8536]
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Thermal Overload Relays [8536]
Type MN - Suitable for MNX Contactor Type RTO - Suitable for MO Contactor
Features Features
› Available in 3 frame sizes from 0.2-570 A › Ambient temperature compensated upto 55oC
› Ambient temperature compensated up to 55оC › Built-in Single Phasing protection
› Built-in Single Phasing protection › Manual and auto reset mode
› Manual and auto reset mode › Front access to START and STOP/RESET buttons
› Conforms IS/IEC 60947-4-1 & IEC 60947-4-1 › Sealable in OFF condition
› Conforms IS/IEC 60947-4-1 & IEC 60947-4-1
MN 2 MN 5 MN 12 MN 12L RTO 1 RTO 2 RTO 3
Type of M.R.P. Std. Type of M.R.P. Std.
Relay Range Relay Range
Mounting Cat. No. (`) Pkg. Mounting Cat. No. (`) Pkg.
(A) (A)
(Operation) Per Unit (Nos.) (Operation) Per Unit (Nos.)
Direct Mounting on MNX 9 - 40 Direct Mounting on MO 9 - 45
0.2 - 0.33 SS94141OOEO 2680 10 0.23 - 0.41 CS96355OOFO 4090 10
0.3 - 0.5 SS94141OOGO 2680 10 0.31 - 0.55 CS96355OOGO 4090 10
0.45 - 0.75 SS94141OOJO 2680 10 0.55 - 0.85 CS96355OOJO 4090 10
0.6 - 1 SS94141OOKO 2680 10 0.78 - 1.2 CS96355OOLO 4090 10
0.9 - 1.5 SS94141OOMO 2780 10 1.2 - 2.0 CS96355OONO 4090 10
MN 2 1.4 - 2.3 SS94141OOPO 2780 10 1.9 - 2.8 CS96355OOPO 4280 10
RTO - 1
(Directly 2 - 3.3 SS94141OOQO 2780 10 2.4 - 3.6 CS96355OOQO 4280 10
(Directly
Operated) 3-5 SS94141OOSO 2780 10 3.5 - 5.2 CS96355OOSO 4280 10
Operated)
4.5 - 7.5 SS94141OOUO 2780 10 4.6 - 6.7 CS96355OOTO 4280 10
6 - 10 SS94142OOVO 2780 10 6.7 - 9.7 CS96355OOVO 4280 10
9 - 15 SS94142OOBO 2900 10 8.5 - 12.5 CS96355OOAO 4330 10
14 - 23 SS94144OODO 3070 10 12.5 - 18.5 CS96356OOCO 4800 10
20 - 33 SS94145OOEO 4630 10 17 - 25.5 CS96356OODO 4800 10
24 - 40 SS94145OOFO 4840 10 25 - 37 CS96356OOEO 7300 10
Direct Mounting on MNX 50 - 80 35 - 45 CS96356OOGO 7530 10
9 - 15 SS94135OOBO 5730 10 Direct Mounting on MO 50 - 70
14 - 23 SS94135OODO 5730 10 5 - 7.5 CS96366OOUO 8610 1
MN 5 7 - 11 CS96366OOVO 8610 1
20 - 33 SS94136OOEO 5730 10
(Directly
30 - 50 SS94136OOGO 7610 10 RTO - 2 10.5 - 16 CS96366OOBO 8610 1
Operated)
36 - 60 SS94136OOTO 7700 10 (Directly 15 - 21 CS96366OOCO 8610 1
Operated) 20 - 31 CS96366OOEO 8960 1
45 - 75 SS94137OOJO 8870 10
66 - 110 SS94137OOKO 9520 10 30 - 43 CS96366OOFO 9970 1
Separate Mounting 40 - 57 CS96366OOSO 11920 1
SB94211OOGO 50 - 75 CS96367OOJO 12320 1
28 - 46.5 14010 1
Direct Mounting on MO 80 - 110
42 - 69 SS94138OOHO 14010 1
23 - 30 CS90873OOEO 13140 1
MN 12 60 - 100 SS94138OOKO 14010 1
(CT Operated) RTO - 3 29 - 38 CS96303OOQO 13660 1
90 - 150 SS94138OOMO 14010 1
(Directly 37 - 49 CS96304OOGO 14090 1
135 - 225 SS94138OOPO 15700 1
Operated) 47 - 62 CS96312OOTO 14350 1
180 - 300 SS94139OOQO 17610 1
60 - 78 CS96313OOJO 16910 1
270 - 450 SS94139OORO 22110 1
75 - 110 CS96314OOKO 18470 1
Separate Mounting
Separate Mounting
42 - 69 SS94127OOHO 41570 1
23.4 - 36 CS97096OOGO 22180 1
60 - 100 SS94127OOKO 41570 1
MN 12L # 36 - 60 CS97096OOJO 22180 1
(CT Operated) 90 - 150 SS94127OOMO 41570 1
57 - 84 CS97096OOKO 22180 1
135 - 225 SS94127OOPO 41570 1 RTO - 4
(CT Operated) 72 - 108 CS97096OOLO 22180 1
180 - 300 SS94127OOQO 41570 1
105 - 156 CS97096OOMO 22180 1
340 - 570 SS94127OOSO 41570 1 138 - 201 CS97096OONO 26320 1
# For motors with longer starting time (Trip class 30) 201 - 291 CS97096OOQO 27490 1
255 - 375 CS97096OORO 33710 1
Lauritz Knudsen, 15.08.2026 12PDF page 20 Thermal Overload Relays [8536]
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Thermal Overload Relays [8536]
Type RX Type ML
Features
› Direct mounting on MX contactor
› Built-in single phasing protection
› Front access to START and STOP/RESET buttons ML
Type of M.R.P. Std. Type of M.R.P. Std.
Relay Range Relay Range
Mounting Cat. No. (`) Pkg. Mounting Cat. No. (`) Pkg.
(A) (A)
(Operation) Per Unit (Nos.) (Operation) Per Unit (Nos.)
0.23-0.41 CS96357OOFO 2420 10 Direct Mounting on ML 1.5 Contactors
0.45-0.78 CS96357OOJO 2420 10 0.15 - 0.25 SS91858OODO 6710 10
RX 0.78-1.2 CS96357OOLO 2420 10 0.25 - 0.4 SS91858OOFO 6710 10
(Directly 1.2-1.9 CS96357OONO 2420 10 0.4 - 0.65 SS91858OOHO 6710 10
Operated) 0.6 - 1 SS91858OOKO 6710 10
1.8-2.8 CS96357OOPO 2420 10 ML 1
2.6-3.6 CS96357OOQO 2420 10 (Directly 1 - 1.6 SS91858OOMO 6710 10
Direct
Operated) 1.5 - 2.5 SS91858OOPO 6710 10
Mounting on 3.6-5.2 CS96357OOSO 2420 10
MX Contactors 4.8-7 CS96357OOTO 2420 10 2.5 - 4 SS91858OORO 6710 10
6.4-9.7 CS96357OOVO 2420 10 4 - 6.5 SS91858OOTO 6710 10
8.2-12.1 CS96357OOAO 2420 10 6 - 10 SS91858OOVO 6710 10
10 - 16 SS91858OOBO 6710 10
Type MU-2P (2 Pole) 11 - 18 SS91858OOCO 6710 10
Direct Mounting on ML 2/3 Contactors
ML 2 / ML 3 9 - 14 SS91859OOAO 9930 10
(Directly 13 - 21 SS91859OOCO 9930 10
Operated) 20 - 32 SS91859OOEO 9930 10
MU-2P 28 - 42 SS91859OOFO 9930 10
Type of Relay Range M.R.P. Std. Type of Relay Range M.R.P. Std.
Mounting Cat. No. (`) Pkg. Mounting Cat. No. (`) Pkg.
(A) (A)
(Operation) Per Unit (Nos.) (Operation) Per Unit (Nos.)
MU 2P (2 Pole) MU 2P (2 Pole)
Direct 1 - 1.6A CS90207OOMO 1130 1 Direct 11 - 18A CS90207OOCO 1260 1
Mounting on 1.5 - 2.5A CS90207OOPO 1130 1 Mounting on 13 - 22A CS90207OODO 1260 1
MU-2P 2.5 - 4A CS90207OORO 1130 1 MU-2P 16 - 26A CS90207OOBO 1260 1
Contactor 4 - 6.5A CS90207OOTO 1130 1 Contactor 20 - 32A CS90207OOEO 1580 1
6 - 10A CS90207OOVO 1130 1 26 - 40A CS90207OOFO 1580 1
9 - 14A CS90207OOAO 1130 1
Accessories for Thermal Overload Relays [8538]
Accessories for Thermal Overload Relays Relay Reset Cord for MN & RTO relay
Relay Mounting Kit Kit for Mounting MN5 Relay Din Rail Mounting Kit
MN2 Relay 400 mm 650 mm 900 mm 1200 mm
M.R.P. Std. M.R.P. (`) Std. Pkg.
Description Cat. No.
Description Cat. No. (`) Pkg. Per Unit (Nos.)
Per Unit (Nos.)
MN Relay reset cord - 400mm SB94207OOOO 1430 1
Push button extn. unit for MN 2 Relays SS94968OOOO 115 100
Kit for Mounting MN 2 Relay on MN Relay reset cord - 650mm SB94208OOOO 1490 1
ML 1.5 contactor SS94701OOOO 395 50
Kit for Mounting MN 2 Relay MN Relay reset cord - 900mm SB94209OOOO 1525 1
separately (Direct Mounting Type) SS94700OOOO 395 50
MN Relay reset cord - 1200mm SB94210OOOO 1715 1
Kit for Mounting MN 5 Relay on
MNX 95 / 110 / 140 contactor SS94638OOOO 635 20 RTO Relay reset cord - 400mm CS90941OOOO 1
1430
Kit for Mounting MN 5 Relay on
ML 2 / ML 3 contactor SS94151OOOO 410 20 RTO Relay reset cord - 650mm CS90942OOOO 1490 1
Kit for Mounting MN5 Relay on RTO Relay reset cord - 900mm CS90943OOOO 1525 1
ML 4 / ML 6 contactor SS94152OOOO 565 20
DIN Rail Mounting Kit Relay on RTO Relay reset cord - 1200mm CS90944OOOO 1715 1
MN 2 Relay SS91887OOOO 310 50
M.R.P.(`) Std. Pkg.
Description Cat. No.
Per Unit (Nos.)
Separate Mounting Kit for RTO-1 Relay Separate Mounting Kit CS96335OOOO 535 1
RTO Relay RTO-2 Relay Separate Mounting Kit CS96306OOOO 1260 1
RTO-3 Relay Separate Mounting Kit CS96307OOOO 1800 1
Lauritz Knudsen, 15.08.2026 13PDF page 21 Electronic Motor Protection Relay [8536]
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Electronic Motor Protection Relay [8536]
Type REO - Electronic Overload Relay To Experience the Benefits of
REO Electronic Overload Relay
Features
› Protections: › Trip indication
» Overload › Selectable Trip class - 10A, 10,
Click or Scan
» Single Phasing, Phase unbalance 20, 30 as per IEC 60947-4-1
» Locked Rotor › Conforms IS/IEC 60947-4-1 & IEC 60947-4-1
» Earth Fault in REO 1.1G & REO 4G
With in-built earth fault
Without earth fault protection protection
Relay Std.
Type of Range Pkg.
Model Mounting M.R.P. Model M.R.P.
(A) Cat. No. (`) Cat. No. (`) (Nos.)
Per Unit Per Unit
0.15 - 0.75 CS90418OOJO 10540 CS90423OOJO 17570 10
Direct 0.6 - 3 CS90418OOQO 10540 CS90423OOQO 17570 10
REO 1.1 REO 1.1G
Mounting on
MO 9-45 2.4 - 12 CS90418OOLO 10540 CS90423OOLO 17570 10
9 - 45 CS90418OOGO 11830 CS90423OOGO 18160 10
REO 4 Separate 18-90 CS90418OOUO 31220 REO 4G CS90423OOUO 31520 1
Mounting 72-360 CS90418OORO 42780 CS90423OORO 42940 1
Type REO - Electronic Over Current Relay
Electronic Overcurrent Relay (EOCR) is a type of Electronic relay that has tripping based on Definite mean time characteristics.
The tripping of relay is decided by trip time selected by user.
Features
› Protections: › Settable start time (5s, 10s, 20s, 40s)
» Overload and trip time (2s, 4s, 8s, 16s)
» Single Phasing, Phase unbalance › Trip indication
» Locked Rotor › Conforms IS/IEC 60947-4-1 & IEC 60947-4-1
Relay M.R.P. Std. Accessories for REO - Electronic Overload Relay
Model Type of Range Cat. No. (`) Pkg.
Mounting Std.
(A) Per Unit (Nos.) M.R.P.
Description Cat. No. (`) Pkg.
0.15 - 0.75 CS91911OOJO 13540 1 Per Unit (Nos.)
Direct 0.6 - 3 CS91911OOQO 13540 1
REO 1.1c REO Relay Reset Cord - 400mm CS90425OOOO 1430 1
Mounting on
MO 9-45 2.4 - 12 CS91911OOLO 13540 1 Separate Mounting Kit for
REO 1.1/1.1G/1.1c Relay CS96335OOOO 535 1
9 - 45 CS91911OOGO 13540 1
Lauritz Knudsen, 15.08.2026 14PDF page 22 Illustrated catalog page
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PDF page 23 Microcontroller based Motor Protection Relay [8536]
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Microcontroller based Motor Protection Relay [8536]
eMPR150 - Electronic Motor Protection eMPR300 - Electronic Motor Protection
Relay Relay with Built-in Earth Fault Protection
› Protections › Protections
» Overload » Overload
» Locked Rotor » Locked Rotor
» Single Phasing, Current Unbalance, » Single Phasing, Current Unbalance,
» Under Current » Under Current
› Inbuilt CT’s (1 A to 88 A) » Earth Fault
› Trip indication » Phase Sequence Reversal
› Test facility › Inbuilt CT’s (1 A to 88 A)
› Site Selectable – Fail-safe / Non › Trip indication
Fail-safe mode › Test facility
› Selectable trip class - 10A, 10, 20 › Site Selectable Phase Sequence -
and 30 as per IEC 60947-4-1 RYB/ RBY
› Site Selectable – Fail-safe / Non
Fail-safe mode
› Selectable trip class - 10A, 10, 20
and 30 as per IEC 60947-4-1
M.R.P. M.R.P.
Thermal O/L Device Model Aux.Supply Thermal O/L Device Cat. No.
Model Aux.Supply Cat. No. (`) (`)
Range (A) Code Range (A) Code
Per Unit Per Unit
1-5.5 EMPR150XAAO 4480 1-5.5 EMPR300XAAO 11760
110V 4-22 EMPR150XABO 6830 110V 4-22 EMPR300XABO 14110
AC AC
16-88 16460
eMPR150
16-88 49, 51LR, EMPR150XACO
9180 eMPR300 49, 51LR, EMPR300XACO
1-5.5 37, 46 EMPR150XBAO 4480 1-5.5 64, 37, 46 EMPR300XBAO 11760
230V 4-22 EMPR150XBBO 6830 230V 4-22 EMPR300XBBO 14110
AC AC
16-88 EMPR150XBCO 9180 16-88 EMPR300XBCO 16460
eMPR selection must be done as per Line Current of Motor eMPR selection must be done as per Line Current of Motor
eMPR300D - Electronic Motor Protection eMPR300I - Electronic Motor Protection Relay
Relay with inbuilt display with inbuilt display & Modbus RTU Communication
One solution for both EOLR and EOCR applications One solution for both EOLR and EOCR applications
› Protections › Protections
» Overload » Overload
» Locked Rotor » Locked Rotor
» Single Phasing, Current Unbalance, » Single Phasing, Current Unbalance,
» Dry Run Protection with Programmable » Dry Run Protection with Programmable
Under Current Under Current
» Earth Fault » Earth Fault
» Phase Sequence Reversal » Phase Sequence Reversal
» Overcurrent » Overcurrent
› 7 Segment LED Display › 7 Segment LED Display
› Inbuilt CT’s (1 A to 88 A) › Inbuilt CT’s (1 A to 88 A)
› 5 trip records › 5 trip records
› Test facility › Test facility
› Site Selectable – Fail-safe / Non › Site Selectable – Fail-safe / Non
Fail-safe mode Fail-safe mode
› Selectable trip class - 10A, 10, 20 › Selectable trip class - 10A, 10, 20
and 30 as per IEC 60947-4-1 and 30 as per IEC 60947-4-1
› Inbuilt Communication port
Modbus - RS-485
M.R.P. M.R.P.
Model Aux.Supply Thermal O/L Device Cat. No. (`) Model Aux.Supply Thermal O/L Device Cat. No. (`)
Range (A) Code Per Unit Range (A) Code Per Unit
1-5.5 EMPR300DCAO 12390 1-5.5 EMPR300ICAO 17850
85-265V 37, 46, 49, EMPR300DCBO 14600 85-265V 37, 46, 49, EMPR300ICBO 20060
eMPR300D 4-22 eMPR300I 4-22 51LR, 51, 64
AC 51LR, 51, 64 AC
16-88 EMPR300DCCO 16800 16-88 EMPR300ICCO 22260
eMPR selection must be done as per Line Current of Motor eMPR selection must be done as per Line Current of Motor
Lauritz Knudsen, 15.08.2026 16PDF page 24 Microcontroller based Motor Protection Relay [8536]
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Microcontroller based Motor Protection Relay [8536]
Application Schemes : eMPR150, eMPR300, eMPR300D, eMPR300I
R R R
Y Y Y
B B B
SCPD SCPD SCPD
In case of Reversible starters; eMPR must sense Line current
eMPR must be placed before in case of STAR-Delta Starter
the reversing contactors.
Contactor Forward Reverse
Contactor Contactor
Line
Contactor
Delta Star
Contactor Contactor
3Ø
Motor
3Ø 3Ø
Motor Motor
DOL RDOL Star - Delta
eMPR300D or eMPR300I with External 5P10 Class CTs for Motors with FLC > 88 Amp
Compact Motor Protection Relay - MM10 Draw-out Motor Protection Relay - MPR21
Features › MPR21 – 37, 46, 48, 49, 50BF, 50, 51, 50N, 51N, 51LR, 64, 66, 74TCS.
› Flush Mounting with display › Microcontroller-based design
› Last trip data recording › Draw-out enclosure.
› Protections:
› CT rating#- 1A/ 5A (site selectable)
» Thermal Overload with pre-alarm
» Short Circuit › Display of 250 event and 30 Trip records
» Earth fault › 128*64 graphical display
» Phase loss, Unbalance, Phase reversal › Modbus RS-485 Communication
» Under Current › Front Micro USB port for numrAL Suite
» Prolong starting, Locked Rotor
Aux. M.R.P. M.R.P. (`)
CT# Device Model Aux. Supply (V) Communication Cat. No.
Model secondary Cat. No. (`) Per Unit
Supply code
Per Unit
20 - 60V DC Modbus RS 485 NRMPR2A28RA 69000
37, 46, 49, numrAL
110 - 240 V MPR21 85 - 265V AC,
MM10* 5 Amp 50 / 51, MM10240E005 46640 Modbus RS 485 NRMPR2B28RA 69000
AC / DC 87 - 265V DC
51LR, 64
#
#
- Protection Class CT - Protection Class CT
*- Available till stock last
Lauritz Knudsen, 15.08.2026 17PDF page 25 Illustrated catalog page
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PDF page 26 iMMR - Intelligent Motor Management Relay [8536]
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iMMR - Intelligent Motor Management Relay [8536]
Display Unit iMMR is a comprehensive Motor protection, control and monitoring
relay for intelligent MCC’s
“Besides control, protection and diagnostics, iMMR provides accurate
real time data for analytics and insights into the performance of plant
and process”
Features
› Comprehensive Current & Voltage based Protections
› 20 nos. of last trip records, 100 event records and 20 IRF Records
are available
› Preprogrammed Starter logics reduces manufacturing and
commissioning time
› Software iMMR Suite is available for Easy and effective
configuration and monitoring
› Ethernet IP, Profinet, Modbus RTU, Modbus TCP/IP and Profibus-
DP protocols available for seamless integration with DCS/PLC
› Redundant network for seamless Motor control and monitoring,
iMMR Main Unit CT Unit with Profinet/ Ethernet IP
Description M.R.P. (`)
Product Cat. No.
Per Unit
iMMR MODBUS RTU 85-265 VAC/DC CS91244OOOO 30000
iMMR PROFIBUS-DP 85-265 VAC/DC *Available On Request
Main Unit iMMR MODBUS TCP/IP 85-265 VAC/DC *Available On Request
iMMR Ethernet IP 85-265 VAC/DC *Available On Request
iMMR Profinet 85-265 VAC/DC *Available On Request
CT1 (0.3-3A) with 15 cm cable CS91245OOOO 6900
CT Unit CT2 (2.5-25A) with 15 cm cable CS91246OOOO 9200
CT3 (7-70A) with 15 cm cable CS91247OOOO 14600
CT1 (0.3-3A) + VT with 15 cm cable CS91249OOOO 15900
CTVT Unit CT2 (2.5-25A) + VT with 15 cm cable CS91250OOOO 18700
CT3 (7-70A) + VT with 15 cm cable CS91251OOOO 24600
Display Unit iMMR Display unit without cable CS91253OOOO 16000
iMMR Display Cable - 1 meter XK13128OOOO 1400
Display Cable
iMMR Display Cable - 2 meter XK13129OOOO 2100
iMMR EXP 4DI + 2DO with 10 cm cable *Available On Request
iMMR EXP 6DI 110V/240V with 10cm cable *Available On Request
Expansion Unit
iMMR EXP Earth Leakage + 2DI + 2DO with 10 cm cable *Available On Request
iMMR EXP 2AI + 1AO with 10 cm cable *Available On Request
* Please contact our nearest branch for details
iMMR with external CT’s for Motors >37kW
S1
S2
-/5 Amp S1
Class 5P10
S2
S1
CT2 Main Unit
S2
Contactor
Pass Through CT
Display Unit
CT Cable
U1 V1 W1
M
Lauritz Knudsen, 15.08.2026 19PDF page 27 iMMR selection guide
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iMMR selection guide
Main Unit
+ CT / CTVT
Unit
+ Display Unit
+ Display Cable
+ Expansion
Unit
= iMMR
for
one motor
For Current Add up to 5
Select based protection Select a panel Expansion
Main Unit select CT Unit. Complete
mounted Unit
based on For Current & package
Display Unit & Cable based
required Voltage based selection of
for monitoring and on DI/DO &
communication protection iMMR.
parametrization. AI/AO
protocol. select requirement.
CTVT Unit.
Cat.no. selection guide
Modbus RTU communication and Current based protection and metering
Main Unit - Display Cable -
Motor Rating Total MRP CT Unit Display Unit
Modbus RTU 2 meter
<1.1 KW 55000 CS91244OOOO CS91245OOOO CS91253OOOO XK13129OOOO
1.1 KW to 11 KW 57300 CS91244OOOO CS91246OOOO CS91253OOOO XK13129OOOO
11 KW to 37 KW 62700 CS91244OOOO CS91247OOOO CS91253OOOO XK13129OOOO
>37 KW 57300 CS91244OOOO CS91246OOOO* CS91253OOOO XK13129OOOO
* with External Protection class CT ,s of -/5Amp
Modbus RTU communication and Current + Voltage based protection and metering
Main Unit - Display Cable -
Motor Rating Total MRP CTVT Unit Display Unit
Modbus RTU 2 meter
<1.1 KW 64000 CS91244OOOO CS91249OOOO CS91253OOOO XK13129OOOO
1.1 KW to 11 KW 66800 CS91244OOOO CS91250OOOO CS91253OOOO XK13129OOOO
11 KW to 37 KW 72700 CS91244OOOO CS91251OOOO CS91253OOOO XK13129OOOO
>37 KW 66800 CS91244OOOO CS91250OOOO* CS91253OOOO XK13129OOOO
* with External Protection class CT ,s of -/5Amp
iMMR Main Unit
iMMR Display Unit
iMMR Display Cable
} iMMR CT/CTVT Unit
with 15 cm cable
Lauritz Knudsen, 15.08.2026 20No matching text found. Try a shorter model code or check the original PDF, including illustrated pages.
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