Merten Bus Coupler 671199, 1-Channel with Centre Position

For building automation installers integrating 3-state switches (e.g., blinds or lighting controls with centre-off position) into a WAGO-I/O-SYSTEM 750, the Merten Bus Coupler 671199 provides a single digital input channel that detects both active states and the centre position, enabling precise control logic.

Key specifications

• Module type: Digital input module
• Number of channels: 1
• Input signal: Digital, for signals with centre position (3-state switches)
• Nominal input voltage: 24 VDC
• Input current: 3 mA per channel
• Input delay: 3 ms (configurable)
• Connection technology: CAGE CLAMP® (push-in type)
• Conductor cross-section: 0.08–2.5 mm² (28–14 AWG)
• Mounting: DIN-rail (35 mm)
• Operating temperature: 0 to 55 °C
• Storage temperature: -25 to 85 °C
• Protection class: IP20
• Isolation voltage: 500 V (system/supply)
• Status indicators: 1x green (power), 1x red (error), 2x yellow (input status)
• Internal bit mapping: 2 bits per channel
• Internal power consumption: 20 mA from system bus
• Housing material: Polyamide 6.6 (PA 6.6)
• Certifications: CE, UL 508, KEMA/EX (ATEX)
• System compatibility: WAGO-I/O-SYSTEM 750
• Wiring type: 2-wire or 3-wire connection

Why choose it

This coupler simplifies wiring for centre-position switches, reducing component count and panel space while ensuring reliable state detection.

Ideal use cases

• Blind or shutter control with centre-off toggle switches
• Lighting scenes requiring three-state input
• Industrial automation with WAGO-I/O-SYSTEM 750

Good to know

The module is designed for DIN-rail mounting and uses push-in CAGE CLAMP® terminals for fast, tool-free wiring.