Description
Product Description
The ABB 1MRK002122-ABR05, detailed further here, is a versatile electrical base or auxiliary relay designed for demanding control and signaling applications within industrial panels and switchgear. While not a programmable logic controller (PLC) itself, it is an indispensable spare part within PLC automation systems, functioning as a robust interface between low-voltage control signals and high-power loads or as an intermediate amplification stage. The core function of the ABB 1MRK002122-ABR05 is to provide reliable, electrically isolated switching based on a control signal, typically from a PLC’s digital output module or another control device. Engineered for long service life and high switching frequency, this relay is a fundamental building block for creating safe and reliable control circuits. For maintenance technicians and panel builders, having a ready supply of trusted components like the ABB 1MRK002122-ABR05 is crucial for minimizing downtime and ensuring system integrity in any automation environment.
Product Parameters
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Manufacturer: ABB
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Product Family: Relays (Auxiliary/Control Relays)
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Model / Order Code: 1MRK002122-ABR05
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Contact Configuration: Typically features multiple changeover (CO) contacts, e.g., 4 CO (4 PDT) contacts.
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Coil Voltage: Available in a range of standard DC and AC voltages (e.g., 24V DC, 48V DC, 110V DC, 110V AC, 230V AC). The specific voltage is defined by the suffix in the order code.
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Contact Rating: Rated for both AC and DC loads, with typical ratings such as 10 A at 250V AC or 30V DC.
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Mounting: Designed for DIN-rail mounting (e.g., on a 35mm top-hat rail).
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Termination: Screw clamp terminals for secure wiring connections.
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Indication: Equipped with a mechanical flag indicator and/or an LED to show the energized state of the coil.
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Standards: Complies with relevant IEC and UL standards for control circuit devices.
Advantages and Features
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High Reliability and Durability: Built for millions of mechanical operations, ensuring long-term performance in repetitive switching applications common in industrial automation.
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Clear Status Indication: The integrated mechanical flag and/or LED provides immediate visual confirmation of the relay’s state, which is vital for troubleshooting.
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Universal Application: The versatile contact configuration (CO) allows it to be used for a wide variety of functions, including signal inversion, amplification, and controlling multiple independent circuits from a single PLC output.
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Easy Installation and Wiring: The DIN-rail mount design and clearly marked, accessible screw terminals simplify panel assembly and field wiring modifications.
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Proven Design: Part of ABB’s extensive and trusted relay portfolio, known for consistent quality and global availability.
Application Cases in Application Fields
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Manufacturing & Machine Control: Used to interface a 24V DC PLC output card with 230V AC contactor coils or solenoid valves, providing voltage isolation and handling the higher inductive load.
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Packaging and Material Handling Lines: Employed as interposing relays to fan out a single control signal to multiple devices (e.g., one “start” command activating several motors or conveyors simultaneously).
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HVAC and Building Management Systems: Functions as the final control element to start/stop fans, pumps, or compressors based on commands from a building automation controller.
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Energy Management Panels: Used in control circuits for automatic transfer switches (ATS) or generator start/stop sequences, where reliable switching is critical.
Comparisons with Competing Products
Compared to similar auxiliary relays from Siemens (3RH series), Schneider Electric (Zelio Relay), or Omron (MY series), the ABB 1MRK002122-ABR05 offers comparable core functionality with some distinct brand-specific considerations:
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Physical Design and Footprint: The physical dimensions, terminal layout, and DIN-rail clip mechanism differ between brands. The ABB design is known for its robust construction and clear markings.
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Accessory Ecosystem: Competitors may offer a wider or different range of snap-on accessories (e.g., additional contact blocks, timers, surge suppressors). The compatibility of such accessories is brand-specific.
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Price and Availability: As a component from a major global manufacturer, it is widely available. Price is typically competitive, with variations based on specific coil voltage and regional distribution.
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System Integration Preference: In panels already populated with ABB breakers, contactors, and other components, standardizing on the ABB 1MRK002122-ABR05 relay simplifies procurement, spare parts stocking, and maintains a uniform aesthetic.
Selection Suggestions and Precautions
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Verify the Exact Coil Voltage: The suffix in the order code (e.g., ABR05) specifies the coil voltage. Ensure the voltage (e.g., 24V DC, 110V AC) matches the control voltage supplied by your PLC system or power supply. Applying the wrong voltage will damage the coil.
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Check the Contact Rating for the Load: Confirm that the relay’s contact current and voltage ratings exceed the requirements of the load (e.g., contactor coil, lamp, small motor) it will be switching. Consider both the steady-state and inrush currents.
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Use Suppression for Inductive Loads: When switching DC coils or other highly inductive loads, always install a suitable suppression device (like a freewheeling diode for DC loads or an RC snubber for AC) across the relay coil to protect the PLC output and increase contact life.
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Ensure Proper Wiring Practice: Use the correct wire gauge for the current, ensure terminals are tightened to the specified torque, and follow good panel layout practices to avoid interference and heat buildup.
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