Why Choose the Finder 26.02.8.012.4000 Impulse Relay?
The Finder 26.02.8.012.4000 is a compact 10 A electromechanical impulse relay designed for convenient switching of lighting and electrical circuits from one or more push-button control points. Part of the Finder Series 26 step relay range, this device features a 12 V AC operating coil and two normally open (2 NO) contacts, making it a practical solution for residential, commercial and light industrial electrical installations.
Unlike a conventional monostable relay, the Finder 26.02.8.012.4000 uses a bistable stepping mechanism that changes the contact state whenever an appropriate electrical impulse is applied to the coil. Once switched, the contacts remain in their new position without continuous coil energisation. This makes impulse relays particularly useful for controlling lighting from multiple momentary push buttons while reducing the need for conventional multi-way switching arrangements.
The relay combines a 10 A contact rating, 250 V AC rated contact voltage and 12 V AC coil supply in a compact housing suitable for installation behind blanking plates and within appropriate electrical mounting boxes. Its electrically separate coil and contact circuits, box-clamp screw terminals and cadmium-free contact construction support straightforward installation and reliable operation.
Key Advantages
- 10 A impulse relay for reliable lighting and electrical circuit control.
- 12 V AC operating coil suitable for compatible low-voltage push-button control systems.
- Two normally open contacts (2 NO) allow two circuits to be switched together.
- Bistable stepping operation maintains the selected contact state without continuous coil power.
- Impulse control enables convenient switching from multiple momentary push buttons.
- 250 V AC rated contact voltage for compatible mains-voltage loads.
- 10 A rated contact current supports a range of lighting and general electrical loads.
- Electrically separate coil and contact circuits allow low-voltage control of suitable higher-voltage loads.
- Compact housing supports installation in appropriate mounting boxes and concealed electrical spaces.
- Box-clamp screw terminals provide secure electrical connections.
- Cadmium-free contact material supports modern electrical installation requirements.
- IP20 protection rating for installation within suitable indoor electrical enclosures.
Key Features
- Finder Series 26 electromechanical step relay.
- Type 26.02 double-pole impulse switching.
- 10 A rated contact current.
- 12 V AC nominal coil voltage.
- 50/60 Hz AC coil operation.
- 2 NO contact configuration.
- 250 V AC rated contact voltage.
- 2500 VA rated AC-1 switching capacity.
- 500 VA rated AC-15 switching capacity.
- 200 A specified inrush current capability under the manufacturer's stated conditions.
- 4.8 VA nominal AC coil consumption.
- Impulse-operated bistable mechanism.
- Two-state switching sequence for simultaneous control of both contacts.
- Minimum control impulse duration of 0.1 s.
- 300,000-operation mechanical life under specified conditions.
- 100,000-operation electrical life at the rated AC-1 load.
- IP20 protection rating.
- −40 to +40 °C ambient operating temperature range.
- Box-clamp terminal connections.
Lighting load ratings are nominal manufacturer values. Actual suitability depends on lamp quantity, driver characteristics, switching inrush current and the installation conditions.
Bistable Impulse Switching for Multi-Point Lighting Control
The Finder 26.02.8.012.4000 operates using an electromechanical stepping mechanism rather than requiring continuous power to hold its contacts in position. When a suitable 12 V AC impulse is applied to the coil, both normally open contacts change state. A subsequent impulse changes them back. The relay therefore maintains its selected switching position between control signals.
This operation is particularly useful for multi-point lighting control. Several momentary push buttons can be connected into an appropriately designed control circuit, allowing the same lighting installation to be switched from different locations. Applications include corridors, stairways, hallways, offices and shared building spaces.
The 2 NO configuration provides two switching contacts that operate together. This allows two compatible lighting groups or electrical circuits to be controlled by the same sequence of impulses, subject to the relay's individual contact ratings and the installation design.
12 V AC Control with Separate Load Switching
The Finder 26.02.8.012.4000 uses a 12 V AC operating coil, enabling compatible low-voltage push-button control arrangements. The coil circuit is electrically separate from the switching contacts, allowing the relay to control suitable mains-voltage electrical loads without requiring the control push buttons to carry the load current.
Because the relay is impulse-operated, the coil does not need to remain continuously energised to maintain the selected contact state. This distinguishes it from conventional monostable installation relays and makes it a practical solution for push-button-controlled lighting systems.
The Series 26 construction is intended for installation in suitable mounting boxes and protected electrical spaces. Its screw terminals and compact format support integration into new electrical installations and appropriate refurbishment projects.
Typical Applications
- Residential lighting control systems.
- Staircase and corridor lighting.
- Hallway and landing lighting circuits.
- Multi-point push-button switching arrangements.
- Commercial office lighting installations.
- Schools and shared building areas.
- Hotel and hospitality lighting control.
- Two-circuit lighting control using a single impulse signal.
- Low-voltage control of compatible mains-powered loads.
- Electrical refurbishment and modernisation projects.
- Building automation using electromechanical step relays.
- General electrical switching applications requiring maintained contact states.
