The CM-MSS.31S belongs to the CM-MSS thermistor motor protection relay range. It operates with a rated control supply voltage of 24 - 240 V AC / DC and has a 1 n/c + 1 n/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 the CM-MSS.31S 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.
Specifications
| Product Net Width | 22.5 mm |
|---|---|
| Product Net Height | 85.6 mm |
| Product Net Depth / Length | 103.7 mm |
| Product Net Weight | 0.128 kg |
| Function | 1 sensor circuit Auto, manual or remote reset Short-circuit detection ATEX approved Dynamic interrupted wire detection Non-volatile fault storage |
| Rated Control Supply Voltage (Us) | 24 ... 240 V AC/DC |
| Rated Frequency (f) | Supply Circuit 15 ... 400 Hz |
| Output | 1 n/o + 1 n/c 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 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 |
| Rated Impulse Withstand Voltage (Uimp) | Output Circuit 1 / Output Circuit 2 4 kV Output Circuit 4 kV |
| 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 | 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 | 4.5 0.8 x 4 Pozidriv 1 |
| Mounting Position | 1 ... 6 |
| Mounting on DIN Rail | TH35-7.5 (35 x 7.5 mm Mounting Rail) acc. to IEC 60715 TH35-15 (35 x 15 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 |
| Ambient Air Temperature | Operation -25 ... +60 °C Storage -40 ... +85 °C |
| Maximum Operating Altitude Permissible | Without Derating 2000 m |
| RoHS Status | Following EU Directive 2011/65/EU |
| 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 2x 20-14 AWG Rigid 1x 20-12 AWG |
| Tightening Torque UL/CSA | 7.08 in·lb |
Documents
- Motor Protection in Potentially Explosive Atmospheres
- New Generation of Thermistor Motor Protection Relays - CM-MSS Range - Protecting Your Motors from Overheating
- Selection Table - Thermistor Motor Protection Relays CM-MSS
- Data sheet - CM-MSS.31S/P with Screw or Push-in Terminals
- 2 PG (USA) Data Sheet for CM-MSE Automatic Reset
- Installation instructions - CM-xxE Range
- Installation instructions - CM-MSS Thermistor Motor Protection Relays
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