Finder 70.61.8.400.0000T 3-Phase Voltage Monitoring Relay, 400 V AC, 1 CO, DIN Rail

In industrial control panels and motor control centers, the Finder 70.61.8.400.0000T monitors three-phase supplies to protect equipment from damaging voltage conditions. It detects phase loss, phase sequence errors, undervoltage, overvoltage, and asymmetry, and switches its relay output to signal a fault or disconnect the load.

Key specifications

• Nominal supply voltage: 3 x 400 V AC + N (operating range 380–415 V AC)
• 1 changeover (CO) relay output, rated 6 A at 250 V AC
• Adjustable thresholds: undervoltage 80–95% Un, overvoltage 105–120% Un, asymmetry 5–20%
• Adjustable trip delay: 0.1–15 s
• LED indication for supply, relay status, and fault
• Mounts on 35 mm DIN rail, width 2 modules (35 mm)
• Operating temperature: -20 to +60 °C

Why choose it

This monitoring relay provides reliable protection for three-phase motors and equipment, preventing damage from phase loss or incorrect phase rotation. Its adjustable thresholds and delay allow adaptation to specific application requirements, while the compact 2-module DIN rail housing saves panel space.

Ideal use cases

• Protecting motors in pumps, compressors, and conveyors
• Monitoring supplies for HVAC equipment and elevators
• Ensuring correct phase sequence for mobile or temporary installations

Good to know

Screw terminals accept a wide range of conductor sizes. The relay output can be wired for alarm or control functions. The front panel provides clear status LEDs for quick diagnostics.