Phoenix Contact 2987927 REL-MR-24DC/21HC AU/MS Single relay

The REL-MR- 24DC/21HC AU/MS is a Phoenix Contact plug-in miniature single relay featuring a multi-layer AgNi contact with hard gold coating and 1 changeover contact. Designed for 24 V DC coil operation across a wide input range of 18.7 V DC to 57.6 V DC, it delivers a switching capacity of 3 A at 240 V AC15. An integrated freewheeling diode, status LED, mechanical position indicator, and test button make it well suited to sensitive signal switching and control panel applications.

Technical specifications:

• Part designation: REL-MR- 24DC/21HC AU/MS
• Catalog number: 2987927
• Manufacturer: Phoenix Contact
• EAN: 4046356481052
• Pack size: 10 pc
• Nominal input voltage: 24 V DC; range: 18.7 V DC to 57.6 V DC
• Typical input current: 17 mA
• Contact type: 1 changeover contact, AgNi hard gold-plated
• Max switching voltage (gold intact): 30 V AC / 36 V DC
• Max switching voltage (gold destroyed): 250 V AC/DC
• Limiting continuous current: 50 mA (gold intact); 16 A (gold destroyed)
• Switching capacity: 3 A at 240 V AC15; 2 A at 24 V DC13
• Response time: 9 ms; release time: 6 ms
• Test voltage: 5 kV AC (winding/contact)
• Mechanical service life: 5,000,000 cycles
• Dimensions (W x H x D): 12.7 mm x 29 mm x 25 mm
• Weight: 18.63 g (excluding packing)
• Operating temperature: -40°C to 70°C; storage: -40°C to 85°C
• Connection: plug/solder
• Country of origin: CN

Features and benefits:

• Multi-layer contact with hard gold coating enables reliable dry switching down to 1 mA at 12 V
• Integrated freewheeling diode suppresses back-EMF on the DC coil side
• Mechanical switching position indicator and status LED provide immediate visual diagnostics
• Test button allows detectable manual actuation without external coil energization
• Wide input voltage tolerance (18.7 to 57.6 V DC) accommodates variable DC supply conditions

Applications:

• PLC and control panel I/O signal switching and isolation
• Industrial automation and machine control dry-contact relay outputs
• Building automation and HVAC system control circuits
• Signal coupling between low-level control and power distribution circuits
• DIN rail control cabinets using compatible RIF-1-BPT or RIF-1-BSC relay bases

Compliant with EN 61810-1, VDE 0435-201, EN 50178, and ISA-S71.04 G3 corrosive gas standard. Meets EU RoHS and EU REACH SVHC requirements.

Also known as: Phoenix Contact REL-MR- 24DC/21HC AU/MS, Phoenix 2987927, Phoenix Contact 24V miniature relay, PC single relay 2987927.