4 Pole 100A Main Switch (WMS4100)

The WMS4100 is a 4 pole 100A main switch designed for safe isolation in three-phase electrical systems.

Part of the Whitecliffe WMS range, this device is a DIN rail mounted main switch / isolator for industrial and residential applications. The manufacturer lists the WMS4100 as a 4 pole 100A main switch with a 230/400V AC rating and contact position indicator, making it a practical choice for compatible three-phase installations, boards, and enclosures.

The WMS range is available in double, three and four pole variants, with cable, U-type busbar and pin-type busbar connection options. For single-phase alternatives, see our main switches and isolators.

• 4 pole, 100A rated – suitable for three-phase isolation
• 230/400V AC – rated for 50/60Hz applications
• DIN rail mounting – mounts on 35mm DIN rail
• Contact position indicator – clear visual status indication
• Busbar compatible – cable, U-type and pin-type busbar connections
• Complies with IEC 60947-3 / EN 60947-3
• Dimensions: 70mm (W) x 82mm (H) x 70mm (D)

• Product Code: WMS4100
• Type: Main switch / isolator
• Poles: 4 pole
• Rated Current (In): 100A
• Rated Voltage (Ue): 230/400V AC
• Frequency: 50/60Hz
• Insulation Voltage (Ui): 500V
• Rated Impulse Withstand Voltage (Uimp): 4000V
• Utilization Category: AC-22A
• Contact Position Indicator: Yes
• Protection Degree: IP20
• Electrical Life: 1500
• Mechanical Life: 8500
• Terminal Connection Type: Cable / U-type busbar / Pin-type busbar
• Terminal Size for Cable: 50mm² / 18-1/0 AWG
• Terminal Size for Busbar: 35mm² / 18-2 AWG
• Tightening Torque: 2.5 N·m
• Mounting: DIN rail EN 60715 (35mm)
• Connection: From top and bottom
• Ambient Temperature: -5°C to +40°C
• Storage Temperature: -25°C to +70°C
• Standards: IEC 60947-3 / EN 60947-3
• Dimensions (W x H x D): 70 x 82 x 70mm

This main switch should be installed by a qualified electrician in accordance with current wiring regulations and manufacturer guidance.

• Mount on a standard 35mm DIN rail to EN 60715
• Connections can be made from the top or bottom
• Suitable for cable, U-type busbar, and pin-type busbar arrangements
• Tighten terminals to the manufacturer’s stated torque of 2.5 N·m
• Check continuity, isolation, and correct switching operation after installation

What is the WMS4100?

The WMS4100 is a 4 pole 100A main switch designed for isolation in three-phase electrical systems.

What voltage is it rated for?

The manufacturer lists the WMS4100 as rated for 230/400V AC at 50/60Hz.

How is the WMS4100 mounted?

It is designed for mounting on a standard 35mm DIN rail to EN 60715.

Can it be used with busbars?

Yes. The datasheet states compatibility with cable, U-type busbar, and pin-type busbar connections.

Does it have a position indicator?

Yes. The WMS range is listed with a contact position indicator.

What standards does it comply with?

The manufacturer states compliance with IEC 60947-3 and EN 60947-3.