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MERSEN FUSE Neutral pole for M250 switches 4P250
Mersen 4P250 neutral-pole accessory for compatible M250 non-fusible disconnect switches, enabling coordinated four-pole isolation of three phases and neutral.
£61.85
Why Choose the Mersen 4P250 Neutral-Pole Switch Accessory?
The Mersen 4P250 is a dedicated neutral-pole accessory designed for use with compatible Mersen M250 non-fusible disconnect switches. It enables a compatible three-pole switch assembly to provide four-pole operation where the neutral conductor must be disconnected alongside the three phase conductors.
Engineered as part of Mersen's modular low-voltage switchgear range, the 4P250 is mechanically coordinated with the main disconnect-switch mechanism. This provides simultaneous switching of the phase and neutral poles for dependable circuit isolation in industrial machinery, distribution panels and switchboard applications.
Designed for the 250 A M250 switch platform, this accessory provides a practical way to configure a four-pole isolation system without replacing the complete disconnect switch. It is intended for professional installation as part of a compatible Mersen UL 98 switch assembly.
Key Advantages
- Adds a dedicated switched neutral pole to a compatible Mersen M250 disconnect switch.
- Enables coordinated isolation of three phases and neutral.
- Designed specifically for the 250 A M250 switch platform.
- Modular construction simplifies switchboard configuration.
- Supports safe maintenance and electrical isolation procedures.
- Manufactured by Mersen for reliable mechanical compatibility.
Key Features
- Mersen 4P250 neutral-pole accessory.
- Compatible with Mersen M250 non-fusible disconnect switches.
- Provides one additional switched pole.
- Designed primarily for neutral conductor isolation.
- Mechanically operated with the main switch poles.
- Suitable for four-pole switch configurations.
- Heavy-duty construction for industrial switchgear.
- Accessory component rather than a complete disconnect switch.
Coordinated Neutral Isolation for Industrial Systems
A neutral-pole accessory allows the neutral conductor to be disconnected at the same time as the three phase conductors. Four-pole isolation may be required in generator systems, transfer applications, separately derived supplies and installations where complete separation from the electrical supply is specified.
The Mersen 4P250 is designed to operate as part of a compatible M250 disconnect-switch assembly. Installation should be completed in accordance with Mersen instructions, the requirements of the complete switchgear system and all applicable electrical regulations.
Typical Applications
- Three-phase and neutral distribution systems.
- Industrial switchboards and control panels.
- Generator and transfer-switch installations.
- Machinery isolation systems.
- Commercial electrical distribution equipment.
- OEM switchgear and power-control assemblies.
Technical Specifications
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| Device Type | Accessory | |
|---|---|---|
| Manufacturer | Mersen | |
| Model | 4P250 | |
| Part number | 4P250 | |
| Product type | Neutral-pole disconnect-switch accessory | |
| Accessory function | Additional switched neutral pole | |
| Number of additional poles | 1 | |
| Compatible switch platform | Mersen M250 | |
| Compatible switch type | Non-fusible disconnect switch | |
| Associated switch current rating | 250 A | |
| Associated switch voltage rating | Up to 600 V AC | |
| Switch standard | UL 98 | |
| Associated IEC standard | IEC 60947-3 | |
| Resulting configuration | Four-pole switch assembly | |
| Installation type | Direct attachment to compatible switch assembly | |
| Application | Coordinated phase and neutral isolation |
Frequently Asked Questions
What is the Mersen 4P250 used for?
The Mersen 4P250 adds a switched neutral pole to a compatible M250 three-pole disconnect switch, enabling coordinated four-pole isolation.
Which switch is compatible with the Mersen 4P250?
The accessory is designed for use with the Mersen M250 non-fusible disconnect-switch platform.
Does the 4P250 switch the neutral conductor?
Yes. It provides an additional pole intended to disconnect the neutral conductor alongside the three phase conductors.
Is the Mersen 4P250 a complete disconnect switch?
No. The 4P250 is an accessory and must be installed as part of a compatible Mersen M250 disconnect-switch assembly.
Where is four-pole isolation commonly used?
Four-pole isolation is commonly used in generator systems, transfer applications and other installations where the neutral conductor must be disconnected with the phase conductors.
Trusted by Switchboard Builders and Electrical Engineers
Mersen disconnect-switch accessories are used by switchboard manufacturers, electrical engineers and industrial contractors to configure dependable isolation systems for industrial and commercial power-distribution applications.
