Ospel switch ŁP-21G/m/33 — momentary (zwierny) wall switch, black metallic

Ospel ŁP-21G/m/33 is a momentary (zwierny) wall switch in a black metallic finish, intended for controlling electrical circuits where a normally-open (NO) contact is required. The device is designed to fit standard mounting frames and integrates with Ospel As series fittings. Its momentary action makes it suitable for pulse control of lighting, door release mechanisms, signalling systems and other applications that require temporary contact closure.

Advantages

The switch provides a compact, mechanically simple solution for temporary contact closure. Its black metallic finish offers a discreet, modern appearance suitable for various interior styles. Designed for compatibility with standard mounting frames, it simplifies replacement or installation within existing wiring systems. The momentary (zwierny) operation reduces the risk of leaving circuits energised continuously, which can be beneficial in access control and signalling applications.

Suitable for

• Pulse control of lighting circuits (e.g., stairwell or corridor lights with relays)
• Door-release or access control push buttons
• Signalling devices and alarms requiring temporary contacts
• Integration into standard wall frames and modular installation systems

When it may not be suitable

The switch is a momentary normally-open contact and is not intended for applications that require a maintained on/off state, such as conventional light switches where the user expects the circuit to remain closed. It is not a multi-way electronic control, dimmer, or smart Wi‑Fi-enabled device. For high-current loads or direct control of motors or heavy equipment, a compatible relay or contactor must be used.

Key specifications

• Type of operation: momentary (normally-open / zwierny)
• Finish: black metallic
• Mounting: standard wall mounting frame compatibility (Ospel As series compatible)
• Intended use: control of lighting circuits, door release and signalling systems
• Switch action: push or toggle-type momentary contact

How to use

Install the switch into a compatible standard mounting frame following local electrical regulations and with power turned off. Connect the supply and load conductors to the switch terminals as required for a normally-open contact; use a relay or controller when switching higher currents or inductive loads. After mounting and securing the rocker, restore power and test the momentary action to confirm temporary contact closure and proper operation with the connected system.

What to consider before purchase

• Verify compatibility with existing mounting frames and faceplates in your installation.
• Ensure the switch’s momentary normally-open function matches the intended control logic.
• Confirm that the connected load will be switched via an appropriate relay or controller when required for higher currents.
• Check local electrical standards and, if necessary, use a qualified electrician for installation.

Usage recommendations

Use the Ospel momentary switch with relays or control modules for lighting circuits and access control to separate low-voltage control from high-current switching. Regularly inspect terminals after installation for secure connections and follow manufacturer guidance for mounting depth and frame alignment.