Thermistor Protection Relays offer protective functions that are easily added and applied to motor control circuits. Typical applications include VFD Controlled Motors, Transformers, Bearings and Compressors.

Monitors over temperature
Connection of up to six PTC thermistors in series
Open and short circuit detection
Short circuit protected signal input
Status indication LED’s
No settings necessary
Compact 22.5mm DIN rail mount housing
Two versions available: Type E1, temperature protection, automatic reset. Type E2, temperature protection, status storage, auto, manual and remote reset options

CE, cULus Listed

This Allen Bradley temperature monitoring relay from Rockwell Automation is an electrically controlled switch that turns the power on or off in a circuit. Its two contacts operate simultaneously to prevent overtemperature, opening or closing when the temperature is within or beyond the preset threshold. The first contact supplies power to a circuit or device, while the second activates an alarm to alert you if the temperature exceeds the desired limit.

• Compact dimensions of 98.8 (L) x 22.5 (W) x 89mm (H) for use in tight spaces
• Broad operating temperature range of -25°C to +60°C for use in a variety of hot and cold environments
• Wide supply voltage range of 24 to 240V AC/DC makes it suitable for most power applications
• Trimmer potentiometers provide a simple way to set overtemperature thresholds

• CE (Conformité Européenne)
• UL (Underwriters' Laboratories)

Monitoring relays are a type of relay that trip a circuit breaker when a fault is detected. They measure a given parameter, such as voltage or temperature, and will trip when the parameters get too high or low. A normal relay doesn't offer this protective monitoring function.