ABB CM-MSS.12S Thermistor Motor Protection Relay - 24 V AC/DC
Part Number: 1SVR730700R0100
Quick Summary
ABB CM-MSS.12S is a thermistor motor protection relay that safeguards small- to mid-size motors used in conveyors, pumps, and machine tools within automated production lines. Sudden motor overheating leads to unplanned downtime, reduced throughput, and costly repairs; CM-MSS.12S detects rising temps with a dedicated sensor circuit to stop damage early. CE, UKCA, UL/CSA, and other approvals help you meet global electrical safety and product documentation requirements, while IP50 housing supports rugged panel installations. Designed for DIN-rail mounting with screw terminals, it integrates easily into OEM and retrofit projects, delivering reliable protection and reduced maintenance. This combination of protection and ease of installation translates into higher machine uptime and lower lifecycle costs for your automation investments.
Product Information
Extended Description
1SVR730700R0100 ABB: The CM-MSS.12S belongs to the CM-MSS thermistor motor protection relay range. It operates with a rated control supply voltage of 24 V AC/DC and has a 1 c/o (SPDT) output with contacts rated at 250 V / 4 A. It features one sensor circuit to monitor PTC temperature sensors and works according to the closed-circuit principle. The relay will be reset automatically after the failure has been removed. A sealable transparent cover for protection against unauthorized changes is available as accessory. The device offers screw connection technology with double-chamber cage connection terminals.
EAN
4013614496721
Minimum Order Quantity
1 piece
Customs Tariff Number
85364900
Data Sheet, Technical Information
Data sheet - CM-MSS.12S/P and CM-MSS.13S/P with screw or push-in terminals
Instructions and Manuals
Instruction Sheet / Manual - CM-MSS Thermistor motor protection relays | Installation instructions - CM-MSS Thermistor motor protection relays
CAD Dimensional Drawing
Information - 2D and 3D files for CAD systems
Product Net Width
22.5 mm
Product Net Height
85.6 mm
Product Net Depth / Length
103.7 mm
Product Net Weight
0.113 kg
Function
1 sensor circuit | Auto reset
Rated Control Supply Voltage (Us)
24 V AC/DC
Rated Operational Voltage
Auxiliary Circuit 250 V AC
Rated Frequency (f)
Supply Circuit 50/60 Hz
Output
1 c/o (SPDT) contact
Terminal Type
Screw Terminals
Rated Operational Current AC-12 (Ie)
(230 V) 4 A
Rated Operational Current AC-15 (Ie)
(230 V) 3 A
Rated Operational Current DC-12 (Ie)
(24 V) 4 A
Rated Operational Current DC-13 (Ie)
(24 V) 2 A
Minimum Switching Capacity
24 V | 10 mA
Rated Impulse Withstand Voltage (Uimp)
Output Circuit 1 / Output Circuit 2 4 kV | Output Circuit 4 kV
Rated Insulation Voltage (Ui)
Measuring Circuit / Output Circuit 300 V | Output Circuit 1 / Output Circuit 2 300 V | Supply Circuit / Output Circuit 300 V
Degree of Protection
Housing IP50 | Terminals IP20
Overvoltage Category
III
Pollution Degree
3
Short-Circuit Protective Devices
Output Circuit NC - F Type Fuses 6 A | Output Circuit NO - F Type Fuses 10 A
Electrical Durability
AC-12 100000 cycle
Mechanical Durability
Nr. Operations 30000000 cycle
Connecting Capacity
Flexible 1x 0.5 ... 2.5 mm² | Flexible 2x 0.5 ... 1.5 mm² | Rigid 1x 0.5 ... 4 mm² | Rigid 2x 0.5 ... 2.5 mm²
Tightening Torque
0.6 ... 0.8 N·m
Wire Stripping Length
8 mm
Recommended Screw Driver
0.8 x 4 | 4.5 | Pozidriv 1
Mounting Position
1 ... 6
Mounting on DIN Rail
TH35-15 (35 x 15 mm Mounting Rail) acc. to IEC 60715 | TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715
Standards
CAN/CSA C22.2 No.14 | IEC/EN 63000 | IEC/EN 60947-5-1 | IEC/EN 60947-8 | UL 508
Maximum Operating Voltage UL/CSA
Output Circuit 300 V AC
Contact Rating UL/CSA
B300
Connecting Capacity UL/CSA
Flexible 1x 18-14 AWG | Flexible 2x 18-16 AWG | Rigid 1x 20-12 AWG | Rigid 2x 20-14 AWG
Tightening Torque UL/CSA
7.08 in·lb
Pilot Duty UL/CSA
B300
Flammability According to UL94
V-0
Ambient Air Temperature
Operation -25 ... +60 °C | Storage -40 ... +85 °C
Maximum Operating Altitude Permissible
Without Derating 2000 m
Conflict Minerals Reporting Template (CMRT)
CMRT - Conflict Minerals Reporting Template
REACH Declaration
REACh Info for Electronic Relays and Controls
RoHS Information
RoHS Declaration of conformity for Electronic Relays and Controls
RoHS Status
Following EU Directive 2011/65/EU and Amendment 2015/863 July 22, 2019
SCIP
0d34b1af-e98f-4381-b064-aeb8bdd8c8b1 Germany (DE)
Simplified SCIP
5e79edc5-1361-41d7-ba9c-adf0f026975a Germany (DE) | 4751a406-5f90-43c2-868c-54613e3e59af Finland (FI) | 8c504388-7ef7-49da-a85c-21a4cefb3c75 Estonia (EE) | b129e627-1ee7-4e6c-bc13-227bab238211 Sweden (SE) | 3313970d-7822-4eaa-9899-65b33f1ca860 Czech Republic (CZ) | c937ff9e-a325-41ab-8d86-9efc6a079a6a Greece (GR) | 839d24a3-cdf7-4451-a1c8-bcebfbe413bc Netherlands (NL) | c9248460-086a-466d-8f6e-1ddfb2205659 Spain (ES) | 3f0c89a1-19c2-4d55-8999-63ddb2ef6278 Portugal (PT) | e05d4def-5114-4d12-afa0-61dc2bf0fb12 Sweden (SE) | cc631f3c-afab-41b6-a365-846cd1b6cbc4 France (FR) | 940e5653-0428-436b-b5bf-b3793a96a804 Croatia (HR) | 5135b9d2-0450-415a-a0f4-42e0203a47b3 Norway (NO) | 16bea55a-7ef5-4112-b33d-74bc5302a429 Poland (PL) | 5598ec91-492d-4fac-8406-4cdaab099613 Hungary (HU) | 2e0f430d-312c-4bdc-b170-575b8b3c6afa Belgium (BE) | f2ccf3c6-fc53-45c8-950a-22740bec575a Italy (IT) | 4fedf9d5-dba3-4c69-9896-27289ce3c0ae Germany (DE) | b12c48c2-7920-4315-9fa1-4cd31f424df3 Germany (DE) | fc634b9b-7476-41ac-886b-eb3d183695a9 Poland (PL) | a99ce688-df7a-4f31-b990-a7fb73de5025 Denmark (DK) | c8d173f1-1961-4d20-b183-901fc11b6bb9 Hungary (HU) | 2f8b8599-9789-4648-8427-9e9d69ac81a5 Bulgaria (BG) | 3bb61915-4d06-4fe3-b0dd-09238a7d1ada Germany (DE) | fef70299-a5d3-4c1c-9e51-6bf1e0d833b9 France (FR) | 706d4974-339c-47ec-95d3-6fb420ae54ea Belgium (BE) | 1f627a7b-885d-4f18-91bf-0956e96b4fb2 Poland (PL)
Toxic Substances Control Act - TSCA
Toxic Substances Control Act (TSCA) declaration for Electronic Relays and Controls
CB Certificate
CB_DK-40837-UL
CCC Certificate
CCC Certificate - Measuring and Monitoring Relays CM-PFS.x, CM-MSS.xxx, CM-MSS, CM-ENS, CM-ENS up/down
CQC Certificate
CQC Certificate, Measuring and Monitoring Relays, CM-PFS.x, CM-PFS, CM-MSS.xyz, CM-ENS, CM-ENS up/down, Made in Germany
cULus Certificate
cULus508_20140912-E140448
Declaration of Conformity - CCC
CCC Declaration of Conformity, Measuring and Monitoring Relays, CM-PFS.x, CM-PFS, CM-MSS.xyz, CM-ENS, CM-ENS up/down, Made in Germany
Declaration of Conformity - CE
EU Declaration of Conformity - CM-MSS.xxx thermistor motor protection relay
Declaration of Conformity - UKCA
UK Declaration of conformity - CM-MSS.xxx thermistor motor protection relay
DNV GL Certificate
DNV GL Certificate Thermistor motor protection relays
Package Level 1 Units
box 1 piece
Package Level 1 Width
97 mm
Package Level 1 Depth / Length
30 mm
Package Level 1 Height
109 mm
Package Level 1 Gross Weight
0.137 kg
Package Level 1 EAN
4013614496721
Object Classification Code
B
ETIM 7
EC002568 - Relay for thermistor protection (PTC)
ETIM 8
EC002568 - Relay for thermistor protection (PTC)
ETIM 9
EC002568 - Relay for thermistor protection (PTC)
eClass
V11.0 : 27371503
UNSPSC
39122331
E-Number (Finland)
2712395
E-Number (Norway)
4185879
E-Number (Sweden)
3860714
Feature: 24 V AC/DC control voltage and a single SPDT output. Business Impact: Enables flexible interfacing with drive controllers and reliable switching, reducing wiring errors and panel footprint. Application: Ideal for 230 V motor circuits and 24 V control networks in conveyors, pumps, and machine tools. Feature: One sensor circuit for monitoring PTC temperature sensors with auto reset. Business Impact: Early fault detection minimizes overheating risk and unplanned downtime; auto reset speeds recovery after a fault. Application: Thermistor-based motor protection in OEM drives and retrofit projects. Feature: Auto reset with sealable cover accessory. Business Impact: Improves maintenance efficiency and prevents tampering of protection settings. Application: Control panels in automation lines requiring secure, automatic fault recovery. Feature: Screw terminals and versatile conductor connections (0.5–4 mm² rigid, 0.5–2.5 mm² flexible). Business Impact: Simplifies wiring, reduces installation time, and supports mixed wiring schemes. Application: Installation in compact control boxes on DIN rails. Feature: Compact DIN rail mounting (TH35-15 or TH35-7.5), 22.5 mm width, IP50 housing. Business Impact: Enables dense panel layouts and rugged operation in industrial environments. Application: OEMs delivering space-efficient motor protection relays in automated lines.
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FAQs
The CM-MSS.12S is designed for TH35-15 or TH35-7.5 DIN rails. Mount it securely, connect the screw terminals with conductors 0.5–4 mm² (rigid) or 0.5–2.5 mm² (flexible), and tighten to 0.6–0.8 N·m. Ensure the ambient temperature and panel clearance meet installation specs for reliable operation.
Control supply voltage is 24 V AC/DC. Output is 1 c/o SPDT with ratings up to 4 A at 230 V AC (and 3 A for AC-15). The device also supports a 250 V auxiliary circuit and operates at 50/60 Hz, enabling straightforward integration with standard motor controllers.
CM-MSS.12S monitors motor temperature via a PTC sensor circuit. If a fault is detected, the relay opens the circuit to protect the motor and automatically resets once the fault condition is cleared, reducing manual intervention and downtime in demanding automation environments.
The device carries CE and UKCA declarations, UL/CSA approvals, and compliance with IEC/EN 60947-5-1 and 60947-8. Additional certifications and declarations ensure global eligibility and safe integration into multinational automation projects.
Ideal for conveyors, pumps, and machine tools where motor protection and quick fault recovery are critical. Its compact DIN-rail form factor, robust IP50 housing, and screw-terminal connectivity support OEM builds and retrofits, delivering lowered maintenance costs and improved equipment uptime in continuous production lines.