Phoenix Contact 2903677 REL-IR4/LDP-24DC/4X21 Single relay

The REL-IR4/LDP- 24DC/4X21 is a Phoenix Contact plug-in industrial single relay with 4 changeover contacts for 24 V DC coil operation in industrial control and automation applications. It integrates a test button, yellow status LED, freewheeling diode, and mechanical switching position indicator in a compact 21.2 x 27.5 x 35.6 mm housing. AgNi contacts handle up to 6 A continuous current and 250 V AC/DC maximum switching voltage.

Technical specifications:

• Part designation: REL-IR4/LDP- 24DC/4X21
• Catalog number: 2903677
• Manufacturer: Phoenix Contact
• EAN: 4046356758901
• Nominal input voltage: 24 V DC
• Input voltage range: 18.7 - 46.8 V DC (at 20°C)
• Contact type: 4 changeover contacts, AgNi
• Limiting continuous current: 6 A
• Maximum switching voltage: 250 V AC/DC
• Interrupting rating (ohmic): 1500 VA at 250 V AC
• Rated insulation voltage: 250 V AC
• Rated surge voltage: 2.5 kV
• Test voltage (winding/contact): 2.5 kVrms
• Drive: monostable, polarized (A1+, A2-)
• Mechanical service life: approx. 2 x 10^7 cycles
• Ambient temperature (operation): -40°C - 70°C
• Ambient temperature (storage): -40°C - 85°C
• Dimensions (W x H x D): 21.2 x 27.5 x 35.6 mm
• Weight: 34.4 g (excluding packing)
• Connection: plug-in
• Mounting position: any
• Overvoltage category II, pollution degree 2
• Degree of protection: RT I
• Corrosive gas rating: ISA-S71.04 G3 Harsh Group
• Approvals: CSA, VDE, cULus Recognized (E172140)
• Pack size: 10 pc
• Country of origin: Poland

Features and benefits:

• Freewheeling diode protects the coil circuit from voltage spikes on deenergization
• Status LED and mechanical switching position indicator enable instant visual relay monitoring
• Test button allows relay verification during commissioning without a live control signal
• 100% operating factor supports continuous duty; ISA-S71.04 G3 rated for corrosive gas environments

Applications:

• PLC output switching in industrial automation control panels
• Solenoid valve and actuator control in process automation
• Signal isolation between control and load circuits
• Motor starter auxiliary and interlocking contacts
• HVAC and building automation control systems

Compliant with IEC 60664 and IEC 61810. CSA, VDE, and cULus Recognized (E172140) approved. RoHS and REACH compliant. Compatible relay bases: RIF-2-BPT/4X21 (2900934) and RIF-2-BSC/4X21 (2900932).

Also known as: Phoenix Contact REL-IR4/LDP- 24DC/4X21, Phoenix 2903677, Phoenix Contact 4CO plug-in relay 24V DC.