Phoenix Contact 2987956 REL-MR-24AC/21-21/MS Single relay

The REL-MR- 24AC/21-21/MS is a Phoenix Contact plug-in miniature single relay with 2 changeover contacts and a 24 V AC coil. It includes a test button for detectable manual operation, a mechanical switch position indicator, and an integrated status LED. A limiting continuous current of 8 A and an inrush capacity of 16 A make it suited to demanding industrial switching tasks.

Technical specifications:

• Part designation: REL-MR- 24AC/21-21/MS
• Catalog number: 2987956
• Manufacturer: Phoenix Contact
• EAN: 4046356480666
• Pack size: 10 pc
• Nominal input voltage: 24 V AC
• Input voltage range: 18.7 V AC - 34.8 V AC
• Mains frequency: 50/60 Hz
• Typical input current at UN: 32 mA
• Contact type: 2 changeover contacts, AgNi
• Maximum switching voltage: 250 V AC/DC
• Limiting continuous current: 8 A
• Maximum inrush current: 16 A (20 ms)
• Interrupting rating: 2000 VA at 250 V AC
• Test voltage winding/contact: 5 kV AC (50 Hz, 1 min.)
• Test voltage contact/contact: 2.5 kV AC (50 Hz, 1 min.)
• Maximum power dissipation: 0.77 W
• Typical response time: 3 ms - 12 ms
• Mechanical service life: 5 x 10^6 cycles
• Connection method: Plug / solder connection
• Dimensions (W x H x D): 12.7 mm x 29 mm x 25 mm
• Weight (excluding packing): 18.09 g
• Operating temperature: -40 °C - 70 °C
• Storage temperature: -40 °C - 85 °C
• Country of origin: CN

Features and benefits:

• Test button enables detectable manual operation for safe commissioning and fault-finding
• Integrated status LED gives instant visual confirmation of relay energisation state
• Mechanical switch position indicator shows contact status without live testing
• Wide coil voltage tolerance (18.7 V - 34.8 V AC) accommodates supply fluctuations
• Corrosive gas tested to ISA-S71.04 G3 Harsh Group for challenging environments

Applications:

• Industrial machine control panels switching 24 V AC control circuits
• Motor starter and contactor pilot circuits requiring high inrush current handling
• Building automation and HVAC system control
• Process plant installations in corrosive or harsh atmospheric conditions

Compliant with EN 61810-1, VDE 0435-201, EN 50178, and EN 60068-2-60. UL and cUL Recognized (File E 195083), EAC approved, and VDE drawing approved. EU RoHS compliant with no REACH SVHC above 0.1 wt%. Compatible mandatory bases: RIF-1-BPT/2X21 (push-in, 2900931) and RIF-1-BSC/2X21 (screw, 2900930) for NS 35/7.5 DIN rail mounting.

Also known as: Phoenix Contact REL-MR- 24AC/21-21/MS, Phoenix 2987956, miniature relay 24VAC 2CO plug-in.