Phoenix Contact 2987943 REL-MR-24DC/21-21/MS Single relay

The Phoenix Contact REL-MR- 24DC/21-21/MS is a plug-in miniature single relay with 2 changeover contacts and a 24 V DC coil, designed for reliable load switching in compact control panels and automation systems. Integrated features include a status LED, mechanical switching position indicator, manual test button, and freewheeling diode. The relay handles a limiting continuous current of 8 A at switching voltages up to 250 V AC/DC.

Technical specifications:

• Part designation: REL-MR- 24DC/21-21/MS
• Catalog number: 2987943
• Manufacturer: Phoenix Contact
• EAN: 4046356480659
• Product type: Single relay
• Contact switching type: 2 changeover contacts
• Contact material: AgNi
• Nominal input voltage: 24 V DC
• Input voltage range: 19.2 V DC - 52.8 V DC
• Typical input current: 18 mA
• Limiting continuous current: 8 A
• Maximum inrush current: 16 A (20 ms)
• Maximum switching voltage: 250 V AC/DC
• Interrupting rating (ohmic load): 2000 VA at 250 V AC
• Switching capacity: 1.5 A at 240 V AC15
• Test voltage (winding/contact): 5 kV AC (50 Hz, 1 min.)
• Maximum power dissipation: 0.43 W
• Mechanical service life: 5,000,000 cycles
• Typical response time: 9 ms / release time: 6 ms
• Connection method: Plug / solder connection
• Dimensions (W x H x D): 12.7 mm x 29 mm x 25 mm
• Weight (excluding packing): 18.64 g
• Operating temperature: -40°C to 70°C
• Storage temperature: -40°C to 85°C
• Pack size: 10 pc
• Country of origin: CN
• Approvals: UL Recognized, cUL Recognized (FILE E 195083), EAC, VDE (40027210)

Features and benefits:

• Integrated status LED provides instant visual indication of relay energization state
• Mechanical switching position indicator allows contact status verification without energizing the coil
• Test button enables commissioning and functional checks without an external control signal
• Integrated freewheeling diode suppresses inductive voltage spikes at coil de-energization, protecting driver circuits
• Wide input voltage range (19.2 V DC - 52.8 V DC) accommodates supply fluctuations
• Rated for ISA-S71.04 G3 harsh corrosive gas environments

Applications:

• Switching AC and DC loads in industrial control panels and machine automation
• PLC output signal amplification and interface relay applications
• Motor load switching up to 1/2 HP at 240 V AC
• Control circuits in HVAC, building automation, and process control systems

Compliant with EN 61810-1, VDE 0435-201, and EN 50178. Corrosive gas tested to ISA-S71.04 G3 per EN 60068-2-60. Compatible with Phoenix Contact RIF-1 series relay bases (items 2900931 and 2900930).

Also known as: Phoenix Contact REL-MR- 24DC/21-21/MS, Phoenix 2987943, 24VDC plug-in miniature power relay, double changeover relay.