Finder 3-Phase Monitoring Relay 380-415 V AC, 2 CO, DIN Rail, 70.31.8.400.2022

Industrial electricians and panel builders use this monitoring relay to protect three-phase motors and equipment from phase loss, phase sequence errors, undervoltage, and overvoltage. It monitors a 380-415 V AC supply and provides two changeover contacts for control or alarm circuits.

Key specifications

• Monitoring functions: Phase loss, phase sequence, undervoltage, overvoltage
• Nominal supply voltage: 380-415 V AC, 50/60 Hz
• Voltage monitoring range: 300-480 V AC
• Undervoltage threshold: adjustable 80-95% of Un
• Overvoltage threshold: adjustable 105-120% of Un
• Hysteresis: fixed 2%
• Trip delay: adjustable 0.5-60 s
• Start-up delay: fixed 0.5 s
• Output: 2 changeover contacts, 5 A @ 250 V AC
• Mounting: 35 mm DIN rail, width 2 modules (35 mm)
• LED indication for supply, phase status, relay status
• Operating temperature: -20 to +60 °C
• Terminals: screw type

Why choose it

It combines four essential monitoring functions in a compact 2-module housing, reducing the need for multiple devices. The adjustable thresholds and trip delay allow precise matching to your application, while the fixed hysteresis ensures stable switching.

Ideal use cases

• Protecting motors, pumps, and compressors from phase anomalies
• Ensuring correct phase sequence for equipment with rotating parts
• Monitoring supply voltage in control panels and distribution boards
• Triggering alarms or disconnecting loads on voltage faults

Good to know

The relay is designed for DIN rail mounting and features screw terminals for secure wiring. It is suitable for use in industrial environments with an operating temperature range of -20 to +60 °C.