Finder 70.42.8.400.2032 – 70 Series Line Monitoring relays

Why Choose the Finder 70.42.8.400.2032 Three-Phase Voltage Monitoring Relay?

The Finder 70.42.8.400.2032 is an electronic three-phase voltage monitoring relay designed to supervise the condition of industrial three-phase electrical supplies. Part of the Finder Series 70 monitoring relay range, this device detects potentially damaging supply abnormalities, including phase failure, incorrect phase sequence, phase asymmetry, undervoltage and overvoltage.

Designed for three-phase 380–415 V AC, 50/60 Hz electrical systems, the Finder 70.42.8.400.2032 monitors the connected supply and provides two changeover (DPDT) output contacts rated at 8 A at 250 V AC. Its adjustable 0.5–60 s contact actuation delay supports integration into control systems requiring a defined response to supply abnormalities.

With a compact 35 mm DIN rail mounting arrangement, screw terminals, an IP20 protection rating and an operating temperature range of −20 to +60 °C, this monitoring relay is suitable for industrial control panels, motor control centres, electrical distribution equipment and automated machinery installations.

Key Advantages

• Five monitoring functions: phase failure, phase sequence, phase asymmetry, undervoltage and overvoltage.
• Three-phase 380–415 V AC monitoring for industrial electrical systems.
• Two changeover (DPDT) output contacts for flexible control and signalling.
• 8 A at 250 V AC contact rating for compatible control circuit loads.
• Adjustable 0.5–60 s contact actuation delay for application-specific response timing.
• Supply derived from the monitored electrical system, eliminating the need for a separate auxiliary supply in the specified configuration.
• 35 mm DIN rail mounting for straightforward panel installation.
• 35 mm housing width for efficient use of control cabinet space.
• IP20 protection rating for installation within appropriate electrical enclosures.
• −20 to +60 °C operating temperature range for industrial environments.

Key Features

• Finder Series 70 electronic monitoring relay.
• Three-phase voltage supervision.
• Phase failure detection.
• Incorrect phase sequence detection.
• Phase asymmetry monitoring.
• Undervoltage monitoring.
• Overvoltage monitoring.
• Rated three-phase supply voltage of 380–415 V AC.
• Rated supply frequency of 50/60 Hz.
• Two independent changeover output contacts (2 CO / DPDT).
• 8 A output contact rating at 250 V AC.
• Adjustable contact actuation delay from 0.5 to 60 s.
• Electronic voltage monitoring operation.
• DIN rail mounting for industrial control cabinets.
• Screw-type electrical terminals.
• IP20 degree of protection.
• Compact modular housing.

Reliable Three-Phase Voltage and Phase Sequence Monitoring

The Finder 70.42.8.400.2032 helps improve the reliability of industrial electrical installations by continuously supervising the three-phase supply. Abnormal voltage conditions can affect motors, contactors, control equipment and connected machinery, potentially causing unexpected shutdowns, overheating or equipment damage.

Phase failure monitoring detects the loss of a phase in the electrical supply. This is particularly important for three-phase motors, where operation under phase-loss conditions can cause excessive current in the remaining phases and potentially damage the motor.

Phase sequence monitoring identifies an incorrect phase rotation order. In motor-driven applications, incorrect phase sequence can result in unintended reverse rotation, which may be hazardous for pumps, compressors, conveyors and other rotating machinery.

Undervoltage and overvoltage monitoring help identify supply conditions outside acceptable operating limits, while phase asymmetry monitoring detects voltage imbalance between phases. These functions provide useful supervisory information for industrial electrical protection and automation systems.

The relay's two changeover output contacts can be connected to compatible contactor control circuits, alarm indicators or programmable logic controllers. Its adjustable 0.5–60 s actuation delay allows the monitoring response to be configured for the requirements of the installation.

As a monitoring relay, the Finder 70.42.8.400.2032 does not itself provide short-circuit or overload protection. It should be incorporated into a properly designed electrical protection system using appropriately rated contactors, circuit breakers, fuses and other protective devices.

Typical Applications

• Three-phase industrial electrical supply monitoring.
• Motor control centres and industrial motor starter panels.
• Phase failure detection in three-phase machinery.
• Phase sequence supervision for pumps, compressors and conveyors.
• Overvoltage and undervoltage monitoring in electrical distribution systems.
• Industrial automation and PLC-controlled equipment.
• HVAC and ventilation control installations.
• Industrial pumping and water treatment systems.
• Manufacturing machinery and process equipment.
• Electrical control cabinets and switchgear assemblies.
• Supply abnormality alarm and signalling circuits.
• OEM machinery requiring three-phase voltage supervision.