Description
Mitsubishi Power Supply HK50A-12/A Brief introduction
| Mitsubishi Elevator Switch | |
| Brand | Original |
| Model | HK50A-12/A
|
| Goods No. | X59LX-83 |
| MOQ | 1 |
| Warranty Time | 1 year |
| Certificates | ISO9001 |
| Brand | Mitsubishi |
Mitsubishi Power Supply HK50A-12/A – Rock-Solid 12 V, 50 W for Every Mitsubishi Controller | Nanjing Zhuye Elevator Parts
Hidden inside every Mitsubishi controller cabinet, the HK50A-12/A power supply is the unsung hero that keeps CPUs, sensors and safety chains alive. Delivering a regulated 12 V DC at 4.2 A, it accepts universal 100-240 V AC input and rides out surges, brown-outs and elevator harmonics without a hiccup. When it falters, CPUs reset, encoders lose count and the whole lift appears “dead on arrival”. Nanjing Zhuye Elevator Parts keeps genuine HK50A-12/A units in original packaging, ready for same-day despatch so your cars return to full power without costly OEM delays.
Product snapshot
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Mitsubishi part number HK50A-12/A, revision A3, RoHS compliant
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Input 100-240 V AC, 50/60 Hz, 1.2 A max; PFC > 0.95, THD < 5 %
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Output 12 V DC ±1 %, 4.2 A (50 W), ripple < 50 mV pk-pk, line/load regulation < 0.2 %
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Inrush current limiting, over-voltage, over-current and short-circuit protection with auto-recovery
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MTBF 300 000 h at 25 °C, convection-cooled, no external fan required up to 45 °C
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DIN-rail clip (TS-35/7.5 or TS-35/15), screw-terminals AWG 14-22, 0.5 Nm torque
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Operating temperature −20 °C to +70 °C, humidity 5-95 % RH non-condensing
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UL 508, CE, CB, REACH certified, flame class UL 94-V0
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Size 99 × 97 × 36 mm, 0.24 kg, side-by-side mounting without derating
Where it works
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Mitsubishi elevators LEHY-II, LEHY-M, MAXIEZ, NEXIEZ CPUs, COP and LOP boards
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Escalator controllers JS-B, JS-C, JES-III logic racks, handrail speed sensors, brake coils
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Modernisation packages replacing obsolete 12 V transformers or linear supplies
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Any control cabinet needing a silent, fan-less 50 W rail supply
Installation method – 5-minute rail swap
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Place lift on inspection mode; switch OFF main breaker; lock & tag.
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Wait 3 min for DC bus to discharge; verify zero energy on multi-meter.
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Photograph existing wiring; note 12 V load polarity.
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Release DIN-rail clip; slide old HK50A-12/A upwards and out.
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Clip new unit onto TS-35 rail until latch clicks.
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Connect input L/N/PE (10 mm²) and output +12 V/0 V (2.5 mm²); torque 0.5 Nm.
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Power up; green “DC OK” LED must illuminate within 2 s, ripple < 50 mV on scope.
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Measure output under full controller load; voltage must remain 12.0 ±0.2 V.
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Run car for 10 cycles; verify no CPU reset faults or encoder count errors.
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Log serial number and date in maintenance book.
Replacement cycle & preventive maintenance
Although fan-less, electrolytic capacitors still age. Mitsubishi guideline PS-2024-01 recommends:
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Visual inspection every 6 months: check for vent blockage, swollen caps, loose terminals.
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Output ripple test every 12 months: replace if ripple > 100 mV under full load.
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Replace entire unit every 10 years or 87 600 operating hours (24 h × 365 × 10).
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Immediate replacement if:
– green “DC OK” LED off or flickers,
– output < 11.5 V under rated load,
– ripple > 200 mV (capacitor ESR rise),
– unit temperature > 70 °C on IR camera (vent blocked).
Pro tip: 70 % of premature failures are traced to loose terminals—re-torque to 0.5 Nm every year.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use copper conductors; aluminium creeps and causes hot joints.
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Never mount sideways without 10 mm spacing—convection needs vertical airflow.
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Keep a spare HK50A-12/A in every service van; at 0.24 kg it costs less than one callback.
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After lightning storm, check input surge arrester; a blown MOV can drop voltage and cause resets.
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Order the “Power Bundle” (supply + DIN-rail clip + torque tool) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are a Mitsubishi-authorised distributor, importing HK50A-12/A directly from the factory in Japan, ageing every unit for 2 h at 60 °C and shipping with a 24-month replacement warranty. Stock is stored in humidity-controlled bins to prevent capacitor ageing. Orders placed before 15:00 China time leave the same evening via DHL Express, arriving Europe or North America in 2–4 days. Bulk pricing starts at ten pieces; we can pre-wire ferrules and include a loaner unit to keep your controllers alive during the swap.
Conclusion
The HK50A-12/A power supply is the silent heartbeat behind every Mitsubishi CPU and sensor. By installing the genuine unit, following the torque schedule and replacing it before capacitors age, you eliminate mysterious resets, encoder drift and costly passenger entrapments. Stock genuine HK50A-12/A from Nanjing Zhuye Elevator Parts today—because when 12 V dies, the whole lift stops.
