Finder 70.51.0.240.2032 – 70 Series Line Monitoring relays

Why Choose the Finder 70.51.0.240.2032 Universal Current Monitoring Relay?

The Finder 70.51.0.240.2032 is a multifunctional AC/DC current monitoring relay designed to supervise electrical current in industrial automation, machinery control and electrical distribution applications. Part of the Finder Series 70 monitoring relay range, it provides adjustable undercurrent, overcurrent and current window monitoring within a compact DIN rail-mounted enclosure.

Featuring a 50 mA to 16 A current detection range, the Finder 70.51.0.240.2032 supports six selectable monitoring functions, including undercurrent, overcurrent and window monitoring, each available with or without fault memory. Its 24–240 V AC/DC supply voltage allows integration into a wide variety of industrial control systems.

The relay incorporates one changeover (1 CO / SPDT) output contact rated at 10 A, adjustable hysteresis, programmable response delays through front-mounted controls and multicolour LED status indication. Its 35 mm modular housing provides a practical monitoring solution for electrical engineers, panel builders and industrial maintenance professionals.

Key Advantages

• Universal AC/DC current monitoring for industrial electrical control applications.
• 50 mA to 16 A detection range for monitoring different load currents.
• Six selectable monitoring functions covering undercurrent, overcurrent and window operation.
• Selectable fault memory for retaining detected fault conditions.
• 24–240 V AC/DC supply for flexible integration into industrial control systems.
• 10 A changeover relay output for compatible control and signalling circuits.
• Adjustable hysteresis to reduce unwanted switching around detection thresholds.
• Adjustable start-up lock-out and switch-off delays for application-specific response timing.
• Positive safety logic with output deactivation when a monitored fault is detected.
• Multicolour LED indication for convenient visual status monitoring.
• 35 mm DIN rail housing for compact control panel installation.
• Front-mounted selectors and trimmers for configuration without additional programming equipment.

Key Features

• Finder Series 70 universal current monitoring relay.
• Standard manually adjustable version of the Finder 70.51 monitoring relay.
• AC current detection at 50/60 Hz.
• DC current detection.
• Six selectable current detection ranges.
• Undercurrent monitoring with or without fault memory.
• Overcurrent monitoring with or without fault memory.
• Window monitoring with or without fault memory.
• Current detection range from 0.05 to 16 A.
• 24–240 V AC/DC nominal supply voltage.
• One changeover relay output.
• 10 A rated output current.
• Adjustable hysteresis from 5% to 50% for standard monitoring modes.
• Adjustable window-mode hysteresis from 1% to 99%.
• Adjustable start-up lock-out time from 0.1 to 40 s.
• Adjustable switch-off delay from 0.1 to 30 s.
• Fault memory reset through supply interruption or external reset input.
• Electrical isolation between supply and measuring circuits.
• Multicolour LED status indication.
• Front-mounted selector and adjustment controls.
• 35 mm DIN rail mounting.
• Screw-type terminals.
• IP20 protection rating.

Flexible AC/DC Current Monitoring for Industrial Automation

The Finder 70.51.0.240.2032 provides continuous supervision of current flowing through a monitored electrical circuit. By detecting current levels outside configured operating limits, it allows industrial control systems to identify abnormal load conditions and initiate appropriate control or signalling actions.

In undercurrent monitoring mode, the relay detects when measured current falls below a selected threshold. This can be useful for identifying loss of load, disconnected equipment, reduced mechanical loading or abnormal process conditions. The precise interpretation of an undercurrent condition depends on the equipment being monitored.

In overcurrent monitoring mode, the relay detects current exceeding the selected threshold. This can help identify excessive loading or unexpected increases in electrical demand. It is a monitoring device rather than a replacement for a dedicated motor overload relay, circuit breaker or fuse.

The window monitoring mode supervises current against a defined operating band, enabling detection of both excessive and insufficient current. This is useful in applications where normal operation requires the electrical load to remain within an acceptable range.

Each monitoring mode is available with or without fault memory. When fault memory is selected, a detected fault remains registered until a reset is performed. This supports applications where maintenance personnel need to identify and acknowledge abnormal operating conditions.

The relay includes two independently adjustable timing functions. The start-up lock-out delay (T1) allows temporary abnormal conditions during equipment starting to be ignored, while the switch-off delay (T2) determines the response to a detected fault. Adjustable hysteresis further helps prevent repeated switching when current fluctuates around a configured threshold.

The positive safety logic arrangement means the normally open output contact is closed during satisfactory monitored conditions and opens when a fault is detected. This provides a useful interface for control circuits, alarm systems and automation equipment.

The standard 70.51.0.240.2032 version uses front-mounted selectors and trimmers for configuration. It should be distinguished from the 70.51.0.240.N032 variant, which provides NFC-based programming.

Typical Applications

• Industrial AC/DC current monitoring.
• Undercurrent detection in machinery and process equipment.
• Overcurrent monitoring in electrical control circuits.
• Current window supervision for automated equipment.
• Motor load and operating-condition monitoring.
• Pump and fan load supervision.
• Conveyor and material-handling equipment monitoring.
• Industrial automation and PLC-controlled systems.
• Electrical distribution and control panels.
• Industrial process monitoring and fault indication.
• OEM machinery and electrical control cabinet construction.
• Equipment requiring configurable current thresholds and response delays.