RB.22.9.125.0000 Finder Bistable relay Plugin 8A 110/125 V

Why Choose the Finder RB.22.9.125.0000 Bistable Relay?

The Finder RB.22.9.125.0000 is an industrial bistable latching relay featuring a 110–125 V DC control supply, two changeover contacts and an 8 A contact rating. Part of the Finder RB Series, this relay is designed for electrical control panels, industrial automation and power generation applications where a switching state must be maintained without continuously energising a relay coil.

Unlike a conventional monostable relay, the Finder RB.22.9.125.0000 uses a dual-winding bistable mechanism with separate SET and RESET functions. A suitable control pulse changes the relay's contact position, and the relay mechanically maintains that position after the pulse is removed. This makes it particularly useful for control systems requiring state retention and reduced continuous coil power consumption.

The relay provides two changeover contacts (2 CO / DPDT), allowing two switching circuits to be controlled through the same latching mechanism. With a nominal contact rating of 8 A at 250 V AC, it supports suitable auxiliary control, signalling and resistive load applications.

The Finder RB.22 design incorporates local SET and RESET push-buttons and supports external control arrangements. Its plug-in construction is intended for compatible Finder 90.21 and 90.49 sockets, providing a practical solution for industrial installations requiring accessible wiring and relay replacement.

Key Advantages

• Bistable latching operation maintains the selected contact state without continuous coil energisation.
• 110–125 V DC nominal control supply suits compatible industrial DC control systems.
• Two changeover contacts provide flexible switching and signalling arrangements.
• 8 A nominal contact rating supports suitable industrial control loads.
• Separate SET and RESET functions allow controlled switching between stable states.
• Dual-winding design supports pulse-operated bistable control.
• Integrated SET and RESET push-buttons enable local relay operation.
• External control capability supports remote switching applications.
• Reduced continuous coil consumption compared with relays requiring permanent energisation.
• Plug-in socket mounting simplifies installation and replacement.
• Silver-nickel contacts provide dependable switching performance.
• IP20 protection rating for installation in suitable electrical enclosures.
• Wide operating temperature range supports demanding industrial environments.

Key Features

• Finder RB Series industrial bistable relay.
• Manufacturer part number: RB.22.9.125.0000.
• Two changeover contacts (2 CO / DPDT).
• 8 A nominal switching current.
• 250 V AC nominal contact voltage.
• 400 V AC maximum switching voltage.
• 110–125 V DC nominal coil supply.
• Two-winding bistable control mechanism.
• Separate SET and RESET control functions.
• Local SET and RESET push-buttons.
• Support for remote control push-buttons.
• Silver-nickel (AgNi) contact material.
• 8 A / 15 A nominal and peak contact current ratings.
• 2,000 VA rated AC1 load capacity.
• 4 W nominal coil power.
• Approximately 10 ms SET and 5 ms RESET operating times.
• IP20 degree of protection.
• Socket mounting using compatible Finder 90 Series sockets.

How the Finder RB.22 Bistable Relay Works

The Finder RB.22.9.125.0000 uses a bistable operating mechanism that allows the relay contacts to remain in either of two stable positions without a continuous control supply. This differs from a conventional monostable relay, which normally returns to its rest position when coil power is removed.

The relay incorporates separate SET and RESET windings. Applying an appropriate control pulse to the SET circuit moves the contacts into the set position. Applying a suitable pulse to the RESET circuit returns the contacts to the reset position. Once either operation is completed, the relay retains its selected state without continuous coil energisation.

Its two changeover contacts provide independent common, normally open and normally closed connections. This allows the relay to control two auxiliary circuits, switch between alternative signal paths or provide separate control and status functions.

The integrated SET and RESET push-buttons allow local operation during commissioning and maintenance. The relay also supports remote control arrangements using appropriately wired external push-buttons. Finder provides wiring arrangements for local-only, remote-only and combined local/remote control.

The relay is designed for use with compatible Finder 90.21 and 90.49 sockets. The socket provides the permanent wiring interface, while the relay can be removed or replaced after safe electrical isolation. The correct socket, control wiring and contact load ratings must be verified before installation.

Typical Applications

• Industrial electrical control panels.
• Power generation and distribution control systems.
• Substation auxiliary control circuits.
• Remote SET and RESET switching applications.
• Industrial automation and machinery control.
• Control circuits requiring maintained switching states.
• Electrical interlocking and auxiliary signalling.
• Equipment status and control indication.
• Industrial process control installations.
• Energy-conscious relay control systems.
• OEM electrical equipment manufacturing.
• Maintenance and replacement of compatible bistable relay assemblies.