METZ CONNECT KRA-S12/21-21-21 Coupling Relay, 24 V AC Coil, 3 Changeover Contacts, White 11060913

Industrial control panels and building automation systems often need a reliable interface between low-voltage control signals and higher-power loads. The METZ CONNECT KRA-S12/21-21-21 coupling relay provides that link, switching up to 250 V AC with three changeover contacts. Its compact DIN rail housing and screw terminals simplify installation in distribution boards and control cabinets.

Key specifications

• Coil voltage: 24 V AC
• Contact configuration: 3 changeover contacts (3PDT)
• Max. switching voltage: 250 V AC
• Rated switching current: 6 A per contact
• Max. switching power: 1500 VA
• Operating temperature: -20 to 55 °C
• Mounting: DIN rail
• Connection: screw terminals
• Dimensions: 22.5 x 60 x 61.3 mm
• Weight: 140 g

Why choose it

This relay offers three independent changeover contacts in a narrow 22.5 mm housing, saving space on the DIN rail. The white enclosure blends into modern control panels, and screw terminals provide secure, maintenance-friendly connections.

Ideal use cases

• Switching lighting or heating loads from PLC outputs
• Galvanic isolation between control and load circuits
• Signal multiplication for multiple circuits
• Building automation and HVAC control

Good to know

The relay is rated for 6 A per contact, allowing direct control of moderate loads without an additional contactor. Its 24 V AC coil matches common control transformer outputs.