HySecurity MX000843, CIRCUIT BREAKER, 42 VDC, 120 A
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.
Compatible With
- HySecurity DC power supply systems where MX000843 is specified
- 30F UPS, 40F UPS, and 80 UPS style DC power supply references, plus compatible 42 VDC systems
- UPS-style SlideDriver / HySecurity DC supply diagrams that list this breaker
- Battery/inverter or DC supply service only when rating and parts diagram match
Features and Specifications
| Manufacturer | HySecurity / Nice |
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| Part Number | MX000843 |
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| Product Type | DC circuit breaker |
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| Voltage Rating | 42 VDC |
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| Current Rating | 120 A |
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| Application | DC power supply / UPS protection |
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| Notes | Must match original breaker rating and wiring diagram |
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Also Known As / Related Part Numbers
- MX000843
- Circuit breaker, 42 VDC, 120 A
- 120 A DC circuit breaker
- HySecurity DC breaker
- UPS power supply breaker
Technician Note
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.
Before Ordering Checklist
- Confirm voltage rating is 42 VDC
- Confirm current rating is 120 A
- Compare terminal style and mounting
- Inspect wiring for shorts or heat damage
- Diagnose the cause of any breaker trip before replacement
Professional Advisory
DC power supply service can involve high current. Disconnect AC and DC sources and use a qualified technician for testing and replacement.
Important Ordering Warning
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.
Product Questions and Answers
What is HySecurity MX000843 used for?
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.
How do I confirm MX000843 is the correct part?
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.
Can I use a higher-amp breaker to stop nuisance trips?
No. A breaker that trips should be diagnosed. Installing a higher-amp breaker can create unsafe wiring or equipment damage.
What should I check if this breaker trips?
Check battery condition, charger operation, motor load, wiring shorts, corrosion, and accessory loads before replacing the breaker.
Should a technician install MX000843?
A qualified gate technician is recommended whenever the repair involves electrical wiring, stored energy, moving gate hardware, hydraulic components, or safety-related operation.
