Bistable Relay FF BIS-419 four-function DIN-rail TH 35mm

FF BIS-419 is a bistable (latching) relay designed for installation on a TH 35mm DIN rail. The device integrates four-function bistable relay operation to maintain contact state without continuous coil energization, reducing power consumption during hold conditions. Intended for control panels and distribution cabinets, the BIS-419 supports common building automation and lighting control schemes where stable memory of contact position is required.

Advantages

The FF BIS-419 offers low holding power due to its latching design, which minimizes energy use after switching. Compact DIN-rail mounting and a standardized TH 35mm footprint simplify installation and panel layout. The four-function capability provides flexible control options for momentary, maintained, or pulse-triggered switching, and the relay’s construction is adapted for reliable operation in control and automation environments.

Suitable for

• Lighting circuits and lighting control panels
• Building automation and centralized control systems
• Energy-saving switching and load management
• Control cabinets and DIN-rail distribution boards

Key specifications

• Bistable (latching) relay operation for maintained contact state without continuous coil power
• Four-function control options providing versatile triggering modes
• DIN-rail mounting compatible with TH 35mm rails for compact installation
• Reduced holding power compared with continuous-coil relays
• Designed for use in building automation, lighting control, and control cabinets

How to use

Mount the unit on a TH 35mm DIN rail in a control cabinet or distribution board, ensuring secure mechanical fixation. Wire control and load circuits according to the system schematic and applicable wiring standards, taking care to isolate power before connections. Use the specified control inputs or switching commands to change the relay state; the device will maintain its contact position after the actuation signal ends. Verify correct operation with test actuations before final commissioning.

Usage recommendations

For reliable long-term performance, install the relay in an environment free of excessive vibration, dust, or moisture and observe the manufacturer’s temperature and electrical limits. Use proper wire cross-sections and tighten terminals to recommended torque values. When integrating into automation systems, plan control logic to take advantage of the bistable function for energy savings and to prevent undesired state changes after power interruptions.