METZ Connect RM21 24 V DC Miniature Power Relay, 1 Changeover (SPDT), 10 A, PCB Mount 11051125

In industrial and building automation, reliable signal switching is critical. The METZ Connect RM21 relay provides a compact, high-performance solution for switching loads up to 10 A with a 24 V DC coil. Its single changeover contact (SPDT) makes it versatile for control circuits, HVAC systems, and general-purpose switching applications where dependable operation is essential.

Who is it for

This relay is ideal for electrical engineers, panel builders, and maintenance technicians who need a durable, PCB-mountable relay for automation projects, control cabinets, or replacement in existing equipment. It suits applications requiring a miniature relay with high insulation and long mechanical life.

Main features

• Miniature power relay with 1 changeover contact (SPDT)
• 24 V DC coil with 1440 Ω resistance and approx. 400 mW power consumption
• Switching capacity up to 10 A, 250 V AC / 30 V DC, 2500 VA / 240 W
• High dielectric strength: 5000 V AC coil-contact, 1000 V AC contact-contact
• Long mechanical life: 10 million operations; electrical life: 100,000 operations at rated load
• Wide operating temperature range: -40 °C to +85 °C
• PCB through-hole mounting with 5 pins
• Approvals: VDE, UL, CQC

Specifications

• Relay type: Miniature power relay
• Coil voltage: 24 V DC
• Contact configuration: 1 changeover (SPDT)
• Max. switching current: 10 A
• Max. switching voltage: 250 V AC / 30 V DC
• Max. switching power: 2500 VA / 240 W
• Coil resistance: 1440 Ω
• Coil power consumption: approx. 400 mW
• Contact material: AgNi (silver nickel)
• Insulation voltage (coil-contact): 5000 V AC
• Dielectric strength (contact-contact): 1000 V AC
• Operate time: 10 ms
• Release time: 5 ms
• Operating temperature: -40 °C to +85 °C
• Mounting: PCB through-hole
• Number of pins: 5
• Approvals: VDE, UL, CQC

Tips

Ensure the coil voltage matches your control circuit (24 V DC). For inductive loads, consider using a snubber or diode to protect the contacts and extend relay life. Always verify pin spacing and PCB footprint before soldering.