HySecurity MX000843 is a DC-rated circuit breaker for compatible HySecurity power supply systems. The uploaded data identifies it as a 42 VDC, 120 A circuit breaker. HySecurity DC power supply catalog references list MX000842 and MX000843 in UPS-style power supply diagrams, with MX000842 used in lower-current applications and MX000843 used in higher-current applications. This breaker protects the DC circuit and also serves as part of the power isolation arrangement in the correct enclosure. It must be matched by voltage rating, amperage, terminal style, mounting, and operator power supply diagram. Never upsize or downsize a circuit breaker to stop nuisance trips without diagnosing the cause.
| Manufacturer | HySecurity / Nice |
|---|---|
| Part Number | MX000843 |
| Product Type | DC circuit breaker |
| Voltage Rating | 42 VDC |
| Current Rating | 120 A |
| Application | DC power supply / UPS protection |
| Notes | Must match original breaker rating and wiring diagram |
If the breaker trips, diagnose battery condition, charger output, motor load, wiring shorts, and accessory load before replacing or resetting parts. A tripping breaker is usually a symptom, not the root cause.
DC power supply service can involve high current. Disconnect AC and DC sources and use a qualified technician for testing and replacement.
Do not substitute a different amperage breaker. The 60 A and 120 A versions are not interchangeable unless HySecurity documentation specifically calls for the change.
HySecurity MX000843 is used as a replacement 42 VDC 120 A circuit breaker in HySecurity DC power supply and UPS-style systems. Match it to the original part number and the operator parts diagram before ordering.
Compare the part number on the existing component, the operator model, the control system generation, and the physical or electrical specifications shown in the parts diagram.
No. A breaker that trips should be diagnosed. Installing a higher-amp breaker can create unsafe wiring or equipment damage.
Check battery condition, charger operation, motor load, wiring shorts, corrosion, and accessory loads before replacing the breaker.
A qualified gate technician is recommended whenever the repair involves electrical wiring, stored energy, moving gate hardware, hydraulic components, or safety-related operation.