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Honeywell 51303940-250 Cabinet Fan Assembly With Alarm

The Honeywell 51303940-250, also cataloged as the 51303940-250 Cabinet Fan Assembly With Alarm, provides cabinet airflow control and alarm contact monitoring within Honeywell control system cabinets.

Hardware Specifications

Parameter	Specification
Model	51303940-250
Brand	Honeywell
Product Type	Cabinet Fan Assembly With Alarm
Origin	USA
Weight	1.88 kg
Dimensions	39 x 14.1 x 5.5 cm
Operating Temp	-40 deg C to +70 deg C
Humidity	5-95% RH, non-condensing
Voltage	24 VDC (18-32 V)
Current	0.8 A maximum load
Power Consumption	19.2 W nominal
Alarm Contact Rating	10 W maximum
Switching Voltage	200 VDC peak
Contact Type	AC resistive contact
Tariff Code	8537101190

DCS Cabinet Thermal Management and Alarm Interface

The Honeywell 51303940-250 controls cabinet ventilation through a 24 VDC fan assembly and provides an alarm contact output for cabinet condition monitoring. The unit maintains internal airflow by removing heat generated from installed control hardware.

In addition, the alarm circuit allows the control system to detect fan status conditions through an electrical contact interface. The switching contact supports monitoring applications with defined voltage and power limits.

For Honeywell DCS cabinet installations, proper airflow management supports stable operation of controllers, I/O modules, and communication assemblies. Therefore, technicians should verify fan power wiring, alarm contact wiring, and cabinet ventilation paths during installation and maintenance activities.

Frequently Asked Questions

Q: What power supply does the Honeywell 51303940-250 Cabinet Fan Assembly require?
A: The assembly operates from a 24 VDC supply with an allowable voltage range of 18-32 VDC. The maximum current load is 0.8 A.

Q: What alarm interface is provided by the 51303940-250?
A: The unit provides an alarm contact output with a maximum contact rating of 10 W and a switching voltage limit of 200 VDC peak.

Q: Can the 51303940-250 operate in high temperature cabinet environments?
A: Yes. The specified operating temperature range is -40 deg C to +70 deg C with 5-95% RH non-condensing humidity.

Field Installation Guidelines

• Install the cabinet fan assembly according to the Honeywell cabinet mechanical mounting arrangement and maintain sufficient clearance around airflow openings.
• Connect the 24 VDC power supply using correctly rated field wiring and verify polarity before energizing the circuit.
• Route alarm contact wiring separately from high-current power conductors to reduce electrical interference.
• Ensure the cabinet ventilation path remains unobstructed and remove dust accumulation during scheduled maintenance.
• Verify alarm contact operation after installation by checking the connected monitoring input response.
• Confirm grounding practices follow the cabinet manufacturer's electrical installation requirements.

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