Finder 70.92.0.024.0002 – 70 Series Line Monitoring relays

Why Choose the Finder 70.92.0.024.0002 Thermistor Monitoring Relay?

The Finder 70.92.0.024.0002 is an industrial PTC thermistor temperature monitoring relay designed to protect electric motors and machinery against excessive operating temperatures. Part of the Finder Series 70, this monitoring relay uses PTC thermistor sensors to detect thermal conditions and provide a switching signal for protective control circuits.

Operating from a 24 V AC/DC supply, the Finder 70.92.0.024.0002 features two changeover contacts (2 CO / DPDT) rated at 8 A at 250 V AC. Its monitoring functions include PTC temperature detection, sensor short-circuit detection and sensor wire-break detection, helping identify both excessive temperatures and faults in the thermistor sensing circuit.

With six operating functions, LED status indication, reset terminals and a compact 22.5 mm DIN rail housing, the relay is suitable for industrial motor protection panels, machine control systems and equipment requiring temperature-dependent protective switching. The device uses positive safety logic so that the protective output changes state when a monitored fault is detected.

Key Advantages

• PTC thermistor temperature monitoring for motor and machinery thermal protection.
• 24 V AC/DC supply voltage for compatible industrial control systems.
• Two changeover output contacts (DPDT) for flexible signalling and protective control.
• 8 A contact rating at 250 V AC for suitably rated switching circuits.
• PTC short-circuit detection for identifying sensor circuit faults.
• PTC wire-break detection for monitoring sensor circuit continuity.
• Six operating functions for industrial temperature protection applications.
• Positive safety logic for fault-responsive output operation.
• LED status indication for convenient local monitoring.
• External reset terminals for integration with control systems.
• 35 mm DIN rail mounting for installation in industrial control panels.
• 22.5 mm housing width for space-efficient panel layouts.

Key Features

• Finder Series 70 temperature monitoring relay.
• Type 70.92 PTC thermistor monitoring.
• Nominal supply voltage: 24 V AC/DC.
• Operating supply range: 19.2–26.4 V AC/DC.
• Output configuration: 2 CO (DPDT).
• Rated contact current: 8 A.
• Rated contact voltage: 250 V AC.
• AC-1 switching capacity: 2,000 VA.
• AC-15 switching capacity at 230 V AC: 400 VA.
• PTC sensor short-circuit and wire-break monitoring.
• Six selectable monitoring functions.
• Selectable reset delay: 0.5 s or 3 s.
• LED status indication.
• External reset terminals.
• AgNi contact material.
• IP20 degree of protection.
• Screw terminal connections.
• 35 mm DIN rail mounting in accordance with EN 60715.

Reliable PTC Thermistor Protection for Industrial Motors and Machinery

The Finder 70.92.0.024.0002 monitors temperature through a compatible PTC thermistor sensing circuit. PTC thermistors increase in resistance as their temperature rises, allowing the relay to identify an excessive temperature condition and change the state of its output contacts. This makes the relay useful for monitoring motor winding temperatures and other equipment where direct thermal sensing is required.

In a typical motor protection arrangement, the relay's changeover contacts are connected to a motor contactor control circuit or a compatible automation controller. When the monitored thermistor indicates an excessive temperature or a sensor circuit fault, the output can initiate a motor shutdown, fault indication or other protective response according to the system design.

The device also monitors PTC sensor short circuits and wire breaks, helping distinguish normal operation from abnormal sensing circuit conditions. Its reset facilities and selectable reset delay support integration into industrial control arrangements. The relay is a temperature monitoring device rather than a motor overload relay or short-circuit protective device, so appropriate electrical protection must be provided separately.

Typical Applications

• Electric motor winding temperature monitoring.
• Industrial motor thermal protection circuits.
• Pumps and pumping station control panels.
• Compressors and motor-driven machinery.
• Conveyor and material handling equipment.
• Hoists, cranes and lifting machinery.
• Industrial fans and ventilation systems.
• Woodworking and manufacturing machinery.
• PTC thermistor sensor fault detection.
• Industrial automation and PLC alarm circuits.
• Machine protection and temperature monitoring panels.
• OEM electrical control equipment.