METZ CONNECT Koppelrelais 24 V AC/DC KRA-F10/21-21 2W (11070213)

Industrial control systems often need to switch high-power loads from low-power PLC or controller outputs. The METZ CONNECT KRA-F10/21-21 coupling relay solves this by providing galvanic isolation and signal amplification in a compact DIN-rail module. With a 24 V AC/DC coil and a changeover contact rated up to 250 V AC / 6 A, it reliably interfaces between control logic and actuators, valves, or contactors.

Who is it for

This relay is intended for panel builders, system integrators, and maintenance engineers working in industrial automation, building technology, and machine building. It suits applications where a PLC output must drive a higher-current load or where electrical isolation between control and load circuits is required.

Main features

• 24 V AC/DC coil with low power consumption (0.7 W DC / 1.5 VA AC)
• 1 changeover contact (CO) with silver alloy contacts
• Switching capacity up to 250 V AC / 6 A, 1500 VA
• Screw terminals for secure wiring of conductors up to 2.5 mm²
• DIN rail TS35 mounting for quick installation
• Green LED status indicator for coil energization
• Dielectric strength 4 kV between input and output
• Wide operating temperature range -25 °C to +70 °C
• Housing protection IP40, terminals IP20
• Certifications: CE, UL, cUL, EAC, RoHS

Specifications

• Control voltage: 24 V AC/DC
• Number of contacts: 1 CO (changeover)
• Max. switching voltage: 250 V AC
• Max. switching current: 6 A
• Max. switching power (AC1): 1500 VA
• Connection type: Screw terminals
• Mounting: DIN rail TS35
• Input power consumption: 0.7 W (DC) / 1.5 VA (AC)
• Operating temperature: -25 °C to +70 °C
• Protection degree: IP40 (housing), IP20 (terminals)
• Status indication: Green LED
• Dielectric strength: 4 kVeff input/output
• Mechanical life: 10 x 10⁶ cycles
• Electrical life: 100 x 10³ cycles at rated load
• Housing material: Polyamide (PA)
• Certifications: CE, UL, cUL, EAC, RoHS

Tips

Ensure the coil voltage matches your control signal. For inductive loads, consider using a freewheeling diode or RC snubber to protect the contacts and extend relay life. The relay can be mounted side-by-side on the DIN rail without derating up to the specified ambient temperature.