Home / Honeywell / Honeywell Fire Alarm Panels & Modules / M300MJ 300 Series Monitor Module

Available on request

Honeywell – M300MJ 300 Series Monitor Module

MPN: M300MJ · Brand: Honeywell

Price on request

Discontinued by Honeywell — we can still source the original M300MJ (new, used or refurbished, subject to availability). Request a quote below.

Request a Quote

12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	Honeywell Fire Alarm Panels & Modules
Lifecycle	Discontinued
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

Can I still buy the M300MJ now that it is discontinued?

Yes. Honeywell has discontinued the M300MJ, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.

When can M300MJ be shipped?

M300MJ is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.

Can I pick up M300MJ in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — mention it when you request a quote for M300MJ and we'll include express shipping options in our reply.

My factory is down and I need this urgently — can you help?

For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for M300MJ, subject to availability and destination.

Monitor Modules use to monitor a zone of four-wire smoke detectors, manual fire alarm pull stations, water flow devices, or other normally open dry-contact alarm activation devices. They are used to monitor normally-open supervisory devices with special supervisory indication at the control panel. Monitored circuit may be wired as an NFPA Style B (Class B) or Style D (Class A) Initiating Device Circuit. A 47K ohm End-of-Line Resistor (provided) terminates the Style B circuit. Features & Benefits:

Built-in type identification automatically identifies this device as a monitor module to the control panel

Powered directly by two-wire SLC loop. No additional power required

High noise (EMF/RFI) immunity

SEMS screws with clamping plates for ease of wiring

LED flashes green during normal operation and latches on steady red to indicate alarmCertifications:

UL: S1570

ULC: S1570

FM Approved

CSFM: 7300-0554:131

MEA: 130-00-E

FDNY: COA

Honeywell System Sensor M300MJ — Monitor Modules are intended for use in intelligent, two-wire systems where the individual address of each module is selected using the built-in rotary switches. They offer either two-wire or four-wire fault-tolerant Initiating Device Circuit (IDC). Discontinued by Honeywell — no longer in the current range. PartnerPLC sources new, surplus and discontinued Honeywell parts — request a quote for price, condition and lead time.