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Phoenix Contact REL‑MR‑24DC‑21AU General Purpose Relay

Compact, Reliable Switching for Industrial Control

The Phoenix Contact REL‑MR‑24DC‑21AU is a general‑purpose plug‑in relay designed for reliable switching of loads in automation, machinery, and building control systems. With a 24 V DC coil and gold‑plated contacts, it ensures long service life and stable performance even in low‑level signal applications.

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⚙️ Key Specifications (Model 2961121 REL‑MR‑24DC‑21AU)

• Coil Voltage: 24 V DC
• Contact Configuration: 2 Form A (DPST‑NO)
• Contact Rating: 12 A at 250 V AC / 12 A at 30 V DC
• Contact Material: Gold‑plated silver alloy (AgSnO2 + Au)
• Mechanical Life: ≥30 million operations
• Electrical Life: ≥100,000 operations at rated load
• Mounting: Plug‑in relay base (DIN rail compatible)
• Dimensions: 29 × 12.7 × 25 mm
• Standards Compliance: UL, CSA, IEC certified

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🔑 Features & Benefits

• Gold‑plated contacts: Reliable switching for both low‑level signals and higher loads.
• Compact design: Saves space in control cabinets.
• High durability: Long mechanical and electrical life for continuous duty.
• Versatile use: Suitable for industrial, commercial, and building automation.
• Easy replacement: Plug‑in design simplifies maintenance and upgrades.

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📌 Applications

• Industrial automation panels
• Building management systems
• HVAC control circuits
• Machine safety interlocks
• General switching of AC/DC loads

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📊 Related Phoenix Contact REL‑MR Series Models

Model Code	Coil Voltage	Contacts	Contact Material	Notes
REL‑MR‑24DC‑21AU (2961121)	24 V DC	2 NO	Gold‑plated AgSnO2	Standard 24 V DC relay
REL‑MR‑12DC‑21AU (2961118)	12 V DC	2 NO	Gold‑plated AgSnO2	Low‑voltage coil version
REL‑MR‑48DC‑21AU (2961124)	48 V DC	2 NO	Gold‑plated AgSnO2	Higher coil voltage
REL‑MR‑230AC‑21AU (2961130)	230 V AC	2 NO	Gold‑plated AgSnO2	AC coil version
REL‑MR‑24DC‑11AU (2961119)	24 V DC	1 NO	Gold‑plated AgSnO2	Single‑contact variant

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⚠️ Considerations

• Coil voltage selection: Ensure the relay coil matches your control voltage (12 V, 24 V, 48 V DC or 230 V AC).
• Contact rating: Verify load current and voltage requirements before installation.
• Relay base: Requires compatible Phoenix Contact relay socket for DIN rail mounting.

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✅ Summary: The Phoenix Contact REL‑MR‑24DC‑21AU (2961121) is a compact, gold‑contact general‑purpose relay offering reliable switching for industrial and building automation systems. With multiple coil voltage options available in the REL‑MR series, it provides flexibility for a wide range of applications.

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