ABB CM-MSS.33S Thermistor motor protection relay - ATEX approved
Part Number: 1SVR730712R2200
Quick Summary
CM-MSS.33S thermistor motor protection relay safeguards motors in industrial drives and machinery. This device detects PTC sensor faults and wire interruptions to prevent costly damage and downtime. When faults occur, automated or remote resets restore normal operation, helping minimize production loss. The system carries ATEX approval and CE conformity, with UL/CSA and other standards supporting global deployment in hazardous and general industrial environments. By combining robust protection with straightforward installation, it delivers reliability where predictable motor protection is non-negotiable. For engineers, technicians, and procurement teams, it translates to safer equipment, easier compliance, and lower total cost of ownership through reduced fault-driven downtime and simplified maintenance.
Product Information
Extended Description
1SVR730712R2200 ABB: The CM-MSS.33S belongs to the CM-MSS thermistor motor protection relay range. It operates with a rated control supply voltage of 110-130 V AC and 220-240 V AC and has a 2 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 sensor circuit of this CM-MSS.33S is short-circuit, as well as interrupted-wire monitored and the relay can be reset automatically, manually or remotely after the failure has been removed. This protection relay is certified according to the ATEX directive 94/9/EC and is equipped with a reset / test button. 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
4013614496646
Minimum Order Quantity
1 piece
Customs Tariff Number
85364900
Data Sheet, Technical Information
Data sheet - CM-MSS.32S/P and CM-MSS.33S/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
Ex Operating Instructions
Additional information and notes on safety ATEX - CM-MSS.xx Thermistor motor protection relay
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
0.172 kg
Function
1 sensor circuit | Short-circuit detection | Dynamic interrupted wire detection | Auto | manual or remote reset | ATEX approved
Rated Control Supply Voltage (Us)
110 ... 130 V AC | 220 ... 240 V AC
Rated Operational Voltage
Auxiliary Circuit 250 V AC
Rated Frequency (f)
Supply Circuit 50/60 Hz
Output
2 c/o (SPDT) contacts
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 / Measuring Circuit 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 10 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 | EN 50495 | IEC/EN 63000 | IEC/EN 60079-7 | 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
Toxic Substances Control Act - TSCA
Toxic Substances Control Act (TSCA) declaration for Electronic Relays and Controls
ATEX Certificate
EU Type Examination Certificate_TPS_18_ATEX_044254_0018_X
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 with ATEX
Declaration of Conformity - UKCA
1SVD981007-10
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
0.199 kg
Package Level 1 EAN
4013614496646
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)
2712510
E-Number (Norway)
4185887
E-Number (Sweden)
3860736
Dual supply compatibility lets CM-MSS.33S operate on 110-130 VAC or 220-240 VAC control power, providing flexibility for regional electrical standards. This reduces inventory complexity and streamlines panel design, enabling faster deployment across global sites. Two SPDT outputs deliver versatile control and signaling for motor protection and interlock logic. In practice, you can drive alarms or relay coils from a single device, improving fault visibility and safety while limiting wiring complexity. PTC sensor monitoring with short-circuit and interrupted-wire protection enhances reliability; automatic, manual, or remote reset options minimize downtime when faults occur. ATEX certification and broad standards support compliance in hazardous zones, ensuring safe operation and avoiding non-conformance penalties. A rugged design with IP50 housing, screw terminals, and double-chamber terminals simplifies installation and maintenance, while DIN rail mounting (TH35-15 / TH35-7.5) fits modern control panels. Durability specs—Electrical AC-12 100,000 cycles and Mechanical 30,000,000 cycles—translate to lower maintenance costs and fewer spare parts. Audience-focused insights show these relays reduce commissioning time in conveyors, pumps, and machine tools.
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FAQs
Begin by mounting the CM-MSS.33S on a standard TH35 DIN rail (TH35-15 or TH35-7.5). Use flexible or rigid conductors within the 0.5–4 mm2 range and tighten to 0.6–0.8 N·m. Connect the control supply to 110–130 V AC or 220–240 V AC per your system, wire the two SPDT outputs to the intended load or alarm circuits, and verify the PTC sensor connections. Follow with insulation and conformity checks to ensure safe operation.
CM-MSS.33S provides two SPDT outputs and accepts 110–130 V AC or 220–240 V AC control power. It supports AC-12 up to 4 A at 230 V and DC-12 up to 4 A at 24 V, with a rated impulse withstand voltage of 4 kV. The device monitors PTC sensors, detects short circuits and interrupted wires, and offers automatic, manual, or remote reset for rapid recovery after a fault.
Yes. CM-MSS.33S is ATEX-approved, and its design supports safe operation in hazardous zones. It also carries CE conformity and UL/CSA listings, enabling deployment across global industrial sites that require robust electrical safety and compliance along with reliable motor protection.
CM-MSS.33S features ATEX approval, CE conformity, UL/CSA listings, CCC/CB certifications, and RoHS compliance. These certifications confirm suitability for hazardous and non-hazardous environments, facilitate regulatory approvals, and reduce risk during audits by demonstrating adherence to international safety and performance standards.
By providing automatic, manual, or remote reset options, robust PTC monitoring, and two SPDT outputs for signaling, the relay minimizes fault-driven downtime and simplifies fault isolation. Its durable construction and DIN rail mounting accelerate installation, while certifications support compliance, lowering long-term maintenance and replacement costs in demanding environments.