METZ CONNECT Optocoupler-Triac Module KRE-M4/1AC2 1106312518

Optocoupler-Triac module for galvanic isolation and zero-crossing switching of AC loads up to 1 A. The KRE-M4/1AC2 combines a control input of 20-30 V AC/DC with a load circuit rated for 24-230 V AC, delivering reliable solid-state switching without mechanical wear.

Advantages

Zero-crossing switching minimises inrush currents and electromagnetic interference, while the integrated RC snubber protects against voltage transients. The 2.5 kV input-to-output isolation ensures safe separation between control and load circuits. A green LED indicates active input status.

Suitable for

• Industrial automation and PLC outputs driving small AC loads
• Switching of solenoids, contactors, and indicator lamps
• Building automation and HVAC control circuits
• Replacement of electromechanical relays in low-power AC applications

Key specifications

• Control voltage: 20-30 V AC/DC
• Load voltage: 24-230 V AC
• Continuous load current: 1 A (1.5 A peak)
• Isolation voltage: 2.5 kV
• Mounting: 35 mm DIN rail
• Connection: Screw terminals
• Operating temperature: -20 °C to +60 °C
• Switching frequency: max. 10 Hz

Recommendations

Verify that the load current and voltage are within the rated limits. For inductive loads, ensure the RC snubber is adequate for the application. Mount on a standard 35 mm DIN rail in an enclosure providing appropriate protection.