Thermistor Protection Relay 230VAC, Plug-In

The A-TPR-M Thermistor Protection Relay interfaces with PTC thermistor sensors embedded in motor windings to protect motors from overheating, and monitors for sensor cable faults. It is suitable for electricians and motor maintenance teams protecting motors fitted with embedded PTC sensors.

• Application: Motor winding overheat and cable fault protection
• Sensor type: PTC sensors to DIN44081
• Indication: LEDs for overheat, cable fault (short/open), and latch condition
• Mounting: Plug-in, 11 pin base

Key Features

• Interfaces directly with standard DIN44081 PTC motor winding sensors
• LED indication distinguishes between overheat trip, cable fault, and latch state
• Latching function enabled by bridging terminals 8+9 for manual-reset protection
• Defined trip/recovery thresholds (3100 ohm trip, 1650 ohm recovery) for consistent operation

Typical Applications

• Motor winding overheat protection
• Cable fault monitoring on PTC sensor circuits
• Panel builder motor protection circuits
• Pump and industrial motor protection

Technical Specifications

What's Included

• 1 x A-TPR-M Thermistor Protection Relay

Please note: 11 pin relay base/socket and PTC sensors are not included unless specifically listed above.

Installation & Compatibility Notes

• Confirm the motor is fitted with DIN44081-compatible PTC sensors before ordering.
• Confirm a compatible 11 pin relay base is available or order one separately.
• Installation should be carried out by a suitably qualified electrician where required.

Warranty & Support

This product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.

Zisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.

Need help choosing? If you are unsure whether this product is suitable for your system, contact Zisabo with your application details, voltage, current rating, pin/base configuration or installation environment, and we will assist where possible.