Product Description

Selco M4500-05

The Selco M4500-05 is an Earth Leakage Relay designed for monitoring insulation resistance between an isolated AC voltage distribution network (IT network) and an earth/safety conductor. It provides continuous monitoring and triggers an alarm relay if the insulation resistance drops below a pre-set level. This unit is crucial for ensuring electrical safety and preventing equipment damage in unearthed systems, commonly found in marine, offshore, and industrial applications.

Technical Specifications:

Function: Earth Leakage Relay / Insulation Monitor
Application: Unearthed AC networks (IT systems)
Network Voltage: Up to 690 VAC (Check specific variant documentation for exact range)
Measuring Principle: Low-frequency AC signal injection
Insulation Resistance Setpoint Range: Typically 5 kΩ to 500 kΩ (adjustable)
Output Relay: 1 x SPDT change-over contact (Alarm)
Relay Contact Rating: Typically 250 VAC / 5A or 30 VDC / 5A (resistive load)
Supply Voltage: Commonly 115/230 VAC or 24 VDC (Specify based on exact model ordered)
Mounting: DIN rail
Operating Temperature: -25°C to +70°C
Terminals: Screw terminals
Standards/Approvals: Often includes marine type approvals (e.g., DNV GL, LR, ABS – check specific unit)