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Honeywell M300MJ
300 Series Monitor Module
- MPN
- M300MJ
Price and lead time confirmed within 1 business day
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
- Ships via
- 100% positive eBay feedback
What is the Honeywell M300MJ?
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.
Specifications
Product
| Lifecycle | Discontinued by Honeywell |
| Brand line | System Sensor |
Others
| Brand | System Sensor |
Ordering codes
| Part numbers on this product page | M300MJ, M300MJ-CH, M300MJ/N |
M300MJ: frequently asked questions
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.
More Honeywell parts
Honeywell M300MJPrice and lead time confirmed within 1 business day
Request a Quote