The Honeywell 51303940‑250 Cabinet Alarm Fan is a combined ventilation and status signaling device designed for industrial control enclosures. It circulates air to help manage internal temperatures and features an integrated alarm contact that changes state when airflow drops below safe operating levels. This dual‑function design helps protect sensitive electronics from overheating and enables automation systems to log or act on ventilation issues in real time.

Constructed for continuous industrial use, the fan unit features durable mechanical components that tolerate extended duty cycles in control cabinets exposed to heat, vibration, and moderate contaminants. The alarm interface provides a simple discrete output that can be tied into PLCs or monitoring systems for environmental supervision.

♦ Continuous‑duty ventilation with built‑in alarm contact for low airflow detection
♦ Industrial‑rated construction with vibration‑tolerant bearings and blade design
♦ Designed to integrate within cabinet cutouts or fan panels
♦ Alarm output suitable for discrete input monitoring on PLC or DCS
♦ Compact form factor that fits standard cabinet ventilation openings
♦ Minimal wiring and easy field replacement

This fan module is typically installed in:

Control cabinets housing PLCs, I/O cards, power supplies, and communication modules
Distributed I/O racks where space and airflow are limited
Remote junction enclosures that need active airflow management
Environmental monitoring systems where automated fan alarms feed into alarm logs or operator displays
Cabinets prone to elevated temperatures due to heat‑generating modules

By combining airflow support with alarm signaling, it helps reduce the risk of thermal‑related faults and supports proactive maintenance strategies.

Parameter	Specification
Brand / Manufacturer	Honeywell
Model Number / Part Number	51303940‑250
Product Type	Cabinet Fan with Alarm
Alternate Model Name	MC‑FAN511
Country of Origin	USA
Rated Voltage	170–264 V AC
Frequency	50/60 Hz
Rated Current	0.5 A
Power Consumption	8.5 W
Airflow	120 CFM
Protection Class	IP54
Operating Temperature Range	−20 °C to +40 °C
Dimensions (W×H×D)	5.1 × 26.7 × 17.8 cm
Weight	1.925 kg
Alarm Function	Built‑in alarm on fan failure / thermal anomaly

For pricing, availability, or technical consultation regarding this model, please contact our sales team:

【Sales Manager】

Silver

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+86-18020714492

【Email】

sales1@askplc.com

【WeChat】

+86-18020714492

Q1 How does the alarm feature work on this fan?
The fan's built‑in alarm contact opens or closes when airflow falls below a defined threshold, allowing a PLC or monitoring system to detect insufficient ventilation.

Q2 Can this be used with both 24 V DC and AC power?
This specific variant is typically 24 V DC; verify the fan's power specification against your cabinet power supply before installation.

Q3 Is the alarm signal compatible with standard PLC inputs?
Yes, the alarm contact provides a dry change‑of‑state output that can be connected to a discrete PLC/DCS input.

Q4 What maintenance does this fan require?
Regular inspection for dust accumulation and occasional cleaning of blades/intake areas helps maintain airflow performance and extend service life.

Q5 Does the fan operate continuously in harsh environments?
Yes, the fan is built with industrial‑rated components designed for continuous operation in vibration‑prone and electrically noisy control cabinet environments.

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