HONEYWELL GR-2C-DC24V

Product Description

The HONEYWELL GR-2C-DC24V is a plug-in style industrial relay that belongs to Honeywell’s GR series, a family widely recognized for its reliability and versatility in control panel applications. This specific model, HONEYWELL GR-2C-DC24V, features a 24 V DC coil and dual form-C (DPDT—Double Pole Double Throw) contacts, providing two independently controlled switching circuits within a single compact housing. Engineered for industrial environments, the HONEYWELL GR-2C-DC24V incorporates robust contact materials designed to withstand the inrush currents associated with inductive loads such as solenoids and motor starters. The clear, finger-safe housing allows for visual status indication (typically via an integrated LED) and facilitates rapid replacement in the field without requiring rewiring, making the HONEYWELL GR-2C-DC24V an ideal choice for maintenance-sensitive applications.

Technical Parameters

• Model Number: HONEYWELL GR-2C-DC24V

• Series: GR Series General Purpose Relay

• Coil Voltage: 24 V DC

• Contact Configuration: 2 Form-C (DPDT—Double Pole Double Throw)

• Contact Rating: Typically 10 A at 250 V AC / 30 V DC (resistive load)

• Contact Material: Silver alloy (AgCdO or equivalent) for high inrush tolerance

• Coil Power Consumption: Approximately 0.9–1.2 W (typical)

• LED Indicator: Built-in LED for coil status visualization

• Mounting: Plug-in socket (compatible with Honeywell or industry-standard 8-pin octal sockets)

• Operating Temperature: -25°C to +55°C

• Mechanical Life: 10 million operations (typical)

• Electrical Life: 100,000 operations at rated load (typical)

Advantages & Features

• Versatile Switching Capability: The dual form-C contacts on the HONEYWELL GR-2C-DC24V provide exceptional flexibility, allowing engineers to control two separate circuits simultaneously or configure them for applications requiring both normally open and normally closed functions from a single relay.

• High Contact Rating: With a 10 A contact rating, the HONEYWELL GR-2C-DC24V can directly control a wide range of loads without requiring an intermediate contactor, reducing component count and simplifying panel designs.

• Clear Visual Indication: The integrated LED on the HONEYWELL GR-2C-DC24V provides immediate visual confirmation of coil energization, significantly simplifying troubleshooting for maintenance technicians and reducing diagnostic time during system faults.

• Plug-In Convenience: The octal base design of the HONEYWELL GR-2C-DC24V allows for rapid replacement without disconnecting field wiring. When a relay fails, the module can be swapped in seconds, minimizing downtime critical to production environments.

• Robust Contact Design: The silver alloy contact material used in the HONEYWELL GR-2C-DC24V is specifically selected to withstand the high inrush currents characteristic of inductive loads, ensuring extended electrical life in demanding applications.

Application Cases & Fields

The HONEYWELL GR-2C-DC24V is extensively deployed across industries requiring reliable output switching from PLC control systems:

• Packaging Machinery: Used as an interface between PLC output modules and packaging machine components such as heat sealers, cutters, and conveyor motors. The HONEYWELL GR-2C-DC24V provides the necessary current handling capability that typical PLC outputs cannot directly support.

• HVAC Systems: Installed in commercial and industrial HVAC control panels for switching compressors, fans, and damper actuators, leveraging the dual contact configuration of the HONEYWELL GR-2C-DC24V for coordinated control of multiple components.

• Material Handling: Deployed in conveyor systems, sorting equipment, and automated storage and retrieval systems (AS/RS) to interface PLC outputs with motor starters, solenoid valves, and warning beacons.

• Machine Tool Control: Utilized in CNC machines, presses, and machining centers to switch coolant pumps, spindle brakes, and auxiliary equipment where high reliability and easy field replacement are essential.

Comparison with Competing Products

When compared to similar general purpose relays from other manufacturers, the HONEYWELL GR-2C-DC24V offers distinct advantages within its application domain:

• vs. Omron LY2 Series: Both the Omron LY2 and the HONEYWELL GR-2C-DC24V offer similar DPDT configurations and octal base compatibility. However, the HONEYWELL GR-2C-DC24V often features more robust contact materials for handling inductive loads, making it a preferred choice in applications with frequent switching of motors and solenoids. Additionally, the HONEYWELL GR-2C-DC24V provides clearer LED visibility in high-ambient-light environments compared to the Omron equivalent.

• vs. Schneider Electric RXM Series: The Schneider RXM series offers a slim form factor with push-in terminals. The HONEYWELL GR-2C-DC24V competes by offering superior plug-in compatibility with existing octal socket infrastructures, which are common in legacy control panels. For facilities with standardized on Honeywell components, the HONEYWELL GR-2C-DC24V ensures consistent spare parts inventory and simplified procurement.

• vs. TE Connectivity (formerly Potter & Brumfield) KUP Series: The KUP series is a long-standing industry standard. The HONEYWELL GR-2C-DC24V offers comparable electrical performance with the added benefit of a more compact footprint in certain mounting configurations. The HONEYWELL GR-2C-DC24V also typically features a clearer labeling and documentation structure, simplifying panel assembly and troubleshooting.

Selection Suggestions & Precautions

When selecting the HONEYWELL GR-2C-DC24V for your system, consider the following:

1. Verify Coil Voltage: The HONEYWELL GR-2C-DC24V is specifically designed for 24 V DC coil operation. Do not apply AC voltage or DC voltages outside the rated range (typically 20.4–26.4 V DC). Applying incorrect voltage will result in coil failure or unreliable operation. If your system uses 24 V AC or 120 V AC control circuits, select the appropriate GR series variant (e.g., GR-2C-AC24V or GR-2C-AC120V).

2. Confirm Load Type and Current: While the HONEYWELL GR-2C-DC24V is rated for 10 A resistive, inductive loads (motors, solenoids, contactor coils) have significantly higher inrush currents. Derate the contact rating accordingly, typically to 30–50% of the resistive rating for inductive loads. Failure to account for inrush current can cause contact welding and premature relay failure.

3. Socket Compatibility: The HONEYWELL GR-2C-DC24V is designed to mate with standard 8-pin octal sockets (such as Honeywell G-Series sockets or equivalents). Ensure that the socket is rated for the current being switched and that wiring connections are properly torqued. Loose connections can cause overheating and fire hazards.

4. Flyback Diode Protection: When using the HONEYWELL GR-2C-DC24V with inductive DC loads (e.g., DC solenoids, contactor coils), install a flyback diode (also known as a snubber diode) across the load to suppress voltage spikes generated when the contacts open. Without this protection, the back-EMF can cause arcing that significantly reduces contact life or interferes with nearby electronic equipment.

5. Mounting Orientation: The HONEYWELL GR-2C-DC24V can be mounted in any orientation, but ensure adequate clearance for heat dissipation when multiple relays are mounted in close proximity. High-density panels may require spacing or forced ventilation to maintain operating temperatures within specifications.

6. Environmental Considerations: Although the HONEYWELL GR-2C-DC24V is rated for industrial temperatures, avoid installation in areas with high vibration, corrosive atmospheres (such as chemical processing environments), or excessive dust accumulation without proper enclosure protection. Vibration can cause intermittent contact issues, while corrosive gases can degrade contact surfaces over time.