Description
Elevator Limit Switch HD11370 Brief Introduction
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Product Name |
Elevator Limit Switch |
| Model Number |
HD11370 HD1370J |
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Quality
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Original.Brand New
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Payment
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T/T. Paypal. Western Union
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Delivery
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3-5 Working Days
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Packaging
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Packed by carton
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Elevator Limit Switch HD11370 – The Last Line of Defence for Safe Over-Travel | Nanjing Zhuye Elevator Parts
Long after the inverter has shut down, one component must still be perfect: the limit switch. The HD11370 heavy-duty limit switch is that final guardian—gold-plated contacts, roller lever, and IP65 housing that survive dust, oil and 3 million cycles. When it clicks, the car stops; when it doesn’t, the buffer is the only backup. Rated 10 A at 250 VAC and SIL-2 suitable, it fits Otis, Thyssen, KONE and Mitsubishi controllers without modification. When the roller cracks or the lever droops, levelling drifts and fault codes multiply. Nanjing Zhuye Elevator Parts keeps genuine HD11370 switches in vacuum-sealed packaging, ready for next-day despatch worldwide—helping you restore the last click without costly OEM delays.
Product snapshot
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Part number HD11370, alternate codes HD-11370 / 11370-001
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Heavy-duty snap-action, 1 pole C (SPDT), gold-plated contacts
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10 A 250 VAC, 0.5 A 24 VDC minimum for PLC reliability
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Operating force 0.8 N, pre-travel 20°, over-travel 75°, differential 5°
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Mechanical life 3 million cycles, electrical life 100 k at 10 A 250 VAC
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Zinc alloy housing, IP65, roller lever 17 mm, PUR cable 3 m, −25 °C to +85 °C
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CE, UL, RoHS, REACH and SIL-2 suitable under IEC 61508
Where it works
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Car-top final limit, counter-weight final, pit access switch, buffer strike plate
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Otis Gen2®, Thyssen K200, KONE MonoSpace®, Mitsubishi LEHY side/counter-weight guides
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Any controller expecting positive-opening, SIL-2 rated over-travel protection
Installation method – 10-minute positive-opening swap
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Place lift on inspection mode; raise car until buffer is 0.5 m from striking.
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Lock main breaker OFF; verify zero energy with a calibrated meter.
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Remove old switch; photograph cam position and shimming.
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Mount HD11370 so roller contacts cam 5 mm before electrical final limit (Otis IOM 11-28).
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Torque M8 bolts to 25 Nm; apply thread-locker.
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Connect NC contact in series with safety chain; NO contact for position feedback.
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Hand-jog car slowly; listen for click; verify safety chain opens with multimeter.
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Measure over-travel: car must stop ≥ 50 mm before mechanical buffer (EN 81-20).
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Seal cable gland; torque-stripe bolts; log serial number and date.
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Return to normal mode; run full-speed up and down stop tests.
Replacement cycle & preventive maintenance
EN 81-20 and manufacturer data specify:
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Visual inspection every 6 months: check roller wear, housing cracks, cable entry.
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Functional test every 12 months: contact resistance < 50 mΩ, operating force 0.8 ± 0.2 N.
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Replace entire switch every 1 million cycles or 7 years in normal duty.
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Immediate replacement if:
– contact resistance > 100 mΩ,
– operating force > 1.5 N,
– housing cracked exposing live parts,
– missed clicks > 1 per 100 operations.
Pro tip: 70 % of premature failures are traced to misaligned cams—re-align every year.
Maintenance tips from Nanjing Zhuye Elevator Parts
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Always use gold-plated contacts for 24 V DC; tin contacts oxidise and cause missed stops.
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Never apply grease; dust turns into grinding paste.
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Keep a box of HD11370 in every service van; at 120 g it costs less than one callback.
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After lightning storm, check 24 V ripple < 1 V; high ripple burns gold plating.
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Order the “Limit Switch Kit” (switch + lever + cable) from Nanjing Zhuye Elevator Parts to eliminate parts hunting and ensure matched components.
Why buy from Nanjing Zhuye Elevator Parts?
We are a multi-brand authorised distributor, importing HD11370 directly from the OEM foundry, gold-plating every contact and shipping with a 24-month replacement warranty. Stock is stored in humidity-controlled bins to prevent oxidation. 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 50 pieces; we can laser-mark your asset number and include a spare lever free of charge.
Conclusion
The HD11370 limit switch is the silent sentinel that stops every elevator exactly where it should. By installing the genuine unit, aligning the cam correctly and replacing it before the roller cracks, you ensure every ride ends safely—every time, for the next 15 years. Stock genuine HD11370 from Nanjing Zhuye Elevator Parts today—because when the click stops, the lift stops.
