Modular transfer switch Noark 113932 installation power selector 1-0-2 4P 40A 4CO

Noark 113932 is a modular installation transfer/power selector switch with three selectable positions (1–0–2), four poles and a rated current of 40 A. Intended for mounting in electrical distribution panels, the switch enables manual selection and safe isolation between two power sources or loads. Its compact modular form factor fits standard DIN-rail systems and is suitable for residential, commercial and light-industrial control and maintenance tasks where a simple, visible mechanical selector is required.

Advantages

The modular transfer switch delivers reliable mechanical separation of circuits with a clear 1–0–2 switching logic. Its four-pole construction ensures simultaneous switching of all phases and neutral where required, reducing the risk of unsafe partial connections. The device’s 40 A rating supports a range of sub-distribution and equipment supply uses while the DIN-rail compatible modular design simplifies installation and replacement in existing panels.

Suitable for

• Manual selection between two power sources (main and backup) in distribution boards
• Isolation of equipment or circuits for maintenance and testing
• Small commercial and residential sub-distribution switching
• Light-industrial control panels requiring a compact modular selector

When it may not be suitable

This manual selector is not intended for automatic transfer switching where uninterrupted supply switching is required; such applications need an automatic transfer switch or ATS. It may also be unsuitable for high-current industrial mains or motor loads that exceed the 40 A rating or require special arc-extinguishing features beyond a basic mechanical selector.

Key specifications

• Switch positions: 1–0–2 (three-position selector)
• Poles: 4P (four-pole synchronous switching)
• Rated current: 40 A
• Form factor: modular DIN-rail mountable unit
• Contact configuration: change-over style suitable for source selection

How to use

Mount the unit on the DIN rail in the distribution panel following standard electrical installation practices and local regulations. Connect incoming and outgoing conductors to the corresponding terminals for both power sources and the load, ensuring tight and secure terminations. Use the selector lever to choose position 1 (first source), 0 (off/isolation) or 2 (second source) only when loads are in a condition that permits manual switching. Verify that the panel is de-energized or that procedures for safe manual switching are followed where required.

What to consider before purchase

• Confirm that a manual 1–0–2 selector meets your application requirements (manual switching vs automatic transfer)
• Ensure the 40 A rating is sufficient for the connected circuits and consider ambient temperature and installation conditions
• Verify space and compatibility with your DIN-rail distribution board and wiring layout

Usage recommendations

Use the Noark modular selector for clear, manual source selection and isolation in distribution panels. Always follow local electrical codes, use appropriate overload protection upstream, and perform switching operations with knowledge of circuit status to avoid accidental energization or unsafe transitions.