KSF340TPN Fireman switch

Why Choose the ABB KSF340TPN Fireman Switch?

The ABB 2CMA142438R1000, also known as the KSF340TPN, is a robust 40 A three-pole fireman switch designed to provide rapid and dependable electrical isolation during a fire or emergency. It is particularly suitable for disconnecting neon signs, illuminated advertising, exterior lighting and other electrical equipment that could present a hazard to emergency personnel.

The fireman switch features a highly visible red enclosure and an operating handle designed for use with a fireman’s hook stick. Its rigid metal construction and UV-protected finish provide reliable performance in demanding commercial and industrial environments, while the IP65 enclosure protection makes it suitable for both indoor and outdoor installation.

With a rated switching current of 40 A and an operational voltage of up to 690 V AC, the ABB KSF340TPN provides secure isolation for three-phase electrical systems. The switch also includes a fixed neutral terminal and protective earth terminal, making it suitable for five-wire installations where only the three phase conductors require switching.

Key Advantages

• Purpose-designed fireman switch for emergency electrical isolation.
• 40 A switching current for commercial and industrial circuits.
• Supports operational voltages up to 690 V AC.
• Durable IP65-rated enclosure for indoor and outdoor installation.
• Highly visible red finish helps emergency personnel locate the switch quickly.
• Operating handle is suitable for activation with a fireman’s hook stick.
• Padlockable handle helps prevent unauthorised operation.
• Interlocked cover improves safety during installation and maintenance.

Key Features

• ABB KSF series fireman switch.
• Three switched poles for three-phase electrical systems.
• 40 A rated switching current.
• 690 V AC maximum operational voltage.
• Suitable for switching loads up to approximately 15 kW, depending on the application voltage and utilisation category.
• IP65 enclosure protection against dust and low-pressure water jets.
• Rigid metal enclosure with a UV-protected red finish.
• Fixed neutral and protective earth terminals.
• Threaded cable entries at the top and bottom.
• Padlockable emergency operating handle.
• Cover interlock for enhanced operational safety.
• Designed in accordance with IEC 60947-3.

Reliable Emergency Electrical Isolation

Fireman switches are installed in accessible exterior or entrance locations so emergency personnel can quickly disconnect potentially hazardous electrical equipment during a fire. The ABB KSF340TPN provides a clearly identifiable and mechanically reliable means of isolating three-phase circuits without requiring access to the building’s main distribution board.

The operating handle is designed to remain securely in the off position once activated, helping reduce the risk of the circuit being unintentionally re-energised. Its durable enclosure, UV-resistant coating and IP65 protection make the switch well suited to exposed locations on commercial, retail and industrial buildings.

Typical Applications

• Emergency isolation of illuminated signs and advertising displays.
• Neon lighting installations.
• Exterior building and architectural lighting.
• Retail shopfront electrical systems.
• Commercial property electrical installations.
• Industrial buildings and warehouses.
• Hotels, restaurants and entertainment venues.
• Public buildings and transport facilities.
• Three-phase equipment requiring externally accessible isolation.