Why Choose the Mersen 4P125 Fourth-Pole Switch Accessory?
The Mersen 4P125 is a dedicated fourth-pole accessory designed to expand compatible Mersen disconnect switches from three-pole to four-pole operation. It is intended for electrical distribution and industrial control applications where an additional switched pole is required, such as systems that need neutral conductor isolation.
Engineered for use with compatible Mersen M100U3 and M125E3 switches, the 4P125 provides coordinated mechanical switching alongside the main disconnect device. Its modular construction enables panel builders and equipment manufacturers to configure a suitable switching arrangement without replacing the complete switch assembly.
The accessory carries a general-use rating of 100 A at 600 V AC and accepts a broad conductor range. Its compact design, robust terminals and defined tightening requirements support dependable installation in industrial switchboards, machinery panels and electrical distribution equipment.
Key Advantages
- Adds a fourth switched pole to compatible Mersen disconnect switches.
- Suitable for applications requiring switched neutral isolation.
- 100 A general-use current rating.
- 600 V AC rated voltage for industrial electrical systems.
- Designed for coordinated operation with the main switch mechanism.
- Modular construction simplifies panel and equipment configuration.
Key Features
- Mersen 4P125 fourth-pole accessory.
- Compatible with Mersen M100U3 and M125E3 disconnect switches.
- 100 A general-use rating.
- 600 V AC rated voltage.
- Single additional switching pole.
- Suitable for copper conductors from 10 to 70 mm².
- Compatible with conductor sizes from 8 AWG to 1/0 AWG.
- 6 Nm terminal tightening torque.
- Compact modular format for control-panel installation.
Flexible Four-Pole Isolation for Electrical Systems
A fourth-pole accessory allows an appropriate disconnect switch to isolate an additional conductor at the same time as the three main phase conductors. This is commonly required in installations where the neutral conductor must be switched for maintenance, safety or system-design purposes.
The Mersen 4P125 is mechanically coordinated with its compatible switch assembly, helping ensure that all poles change state together. The accessory should be installed only with the specified Mersen switch models and in accordance with the applicable wiring regulations and equipment instructions.
Typical Applications
- Four-pole electrical isolation systems.
- Three-phase systems with a switched neutral.
- Industrial control panels.
- Machinery disconnect assemblies.
- Electrical distribution boards.
- OEM switchgear and power-control equipment.
