Description
Bernstein door contact Vice Switch SEL1-A1Z for Kone Mitsubishi Otis Elevator Brief Introduction
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Product Name
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Bernstein door contact |
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Model
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SEL1-A1Z
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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 Door Contact Vice Switch SEL1-A1Z – The Invisible Guardian That Holds the Door Until It Is Safe
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Most passengers never see the tiny black switch hidden behind the door jamb—yet every ride starts and finishes with it. The SEL1-A1Z “vice switch” is a positively-actuated, snap-action door contact that tells the controller “the door panels are mechanically locked” before the elevator is allowed to move. Nanjing Zhuye Elevator Parts keeps factory-calibrated SEL1-A1Z units on the shelf for same-day despatch. Below we explain what the switch does, how to install it in under five minutes, and the replacement cycle that turns expensive “door lock fault” callbacks into a planned 30-second PM job.
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What SEL1-A1Z Really Means SEL = Safety Edge Lock series
1 = normally-closed (NC) + normally-open (NO) twin contacts
A = standard 10 A silver alloy contacts
1Z = 0.5 mm differential travel, roller lever, IP54 ABS housing
Rated 10 A 250 VAC, 6 A 24 VDC, 1 million mechanical cycles, -25 °C to +80 °C -
Where It Is Used
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Landing door locks (secondary or “vice” contact)
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Car door gate switches on Otis, Thyssen, KONE, Mitsubishi and Chinese MRL systems
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Safety chain in parallel with main lock; opens first if door leaf moves >2 mm
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Simplex or group installations up to 64 floors
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Daily Operation – What the Switch Actually Does
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Roller is depressed by door cam; NC contact closes safety chain, NO contact lights “door locked” LED
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0.5 mm differential travel means switch reacts before the main lock tongue clears—true redundancy
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Snap-action mechanism wipes contacts clean every cycle, preventing high-resistance films
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IP54 housing resists dust and car-wash water jets in shopping-mall entrances
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Installation – 5-Minute Swap Safety first: place controller on INSPECTION, lock main breaker, verify car is on safety props.
Step 1 – Remove two M4 screws holding old switch; photograph wire colours.
Step 2 – Disconnect flying leads; note NC (blue), NO (red), COM (black).
Step 3 – Inspect roller for flat spots; if wear >0.3 mm, replace switch.
Step 4 – Mount SEL1-A1Z with roller facing door cam; torque screws 1.5 N·m.
Step 5 – Adjust cam until roller is compressed 1.0–1.5 mm at full lock—use feeler gauge.
Step 6 – Re-connect leads; tug test >30 N.
Step 7 – Power up; run door on inspection; verify “door locked” LED extinguishes the instant door begins to open.
No software, no parameter—true mechanical safety device.
Step 2 – Disconnect flying leads; note NC (blue), NO (red), COM (black).
Step 3 – Inspect roller for flat spots; if wear >0.3 mm, replace switch.
Step 4 – Mount SEL1-A1Z with roller facing door cam; torque screws 1.5 N·m.
Step 5 – Adjust cam until roller is compressed 1.0–1.5 mm at full lock—use feeler gauge.
Step 6 – Re-connect leads; tug test >30 N.
Step 7 – Power up; run door on inspection; verify “door locked” LED extinguishes the instant door begins to open.
No software, no parameter—true mechanical safety device.
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Replacement Cycle & Preventive Maintenance
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High-traffic office (>1,500 door cycles day⁻¹) – inspect monthly, replace every 18 months
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Residential tower (400–800 cycles day⁻¹) – inspect every 6 months, replace every 3 years
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Low-rise freight (≤200 cycles day⁻¹) – inspect annually, replace every 5 years
Replace immediately if:
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Roller diameter <9.5 mm (original 10.0 mm)
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Contact resistance >100 mΩ at 1 A (safety chain fault)
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Housing cracked or IP54 seal missing
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Switch fails to open with 0.5 mm shim test
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Extending Life – 3 Pro Tips
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Keep cam alignment ±0.5 mm; side-loading halves roller life
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Lubricate cam face with lithium spray yearly—never oil the roller (dust magnet)
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Close landing sills properly; gap >3 mm causes roller hammering
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Why Buy SEL1-A1Z from Nanjing Zhuye Elevator Parts?
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Factory-calibrated 0.5 mm travel, no field adjustment needed
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Gold-plated micro-switch option for 24 VDC circuits (order SEL1-A1Z-G)
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Dual stock: 5,200 pcs Nanjing, 1,800 pcs Dubai—next-day delivery
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Bundle kit: switch + roller cam + M4 screws, 8 % cheaper than single piece
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Warranty: 24 months replacement, no RMA wait
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Tech support: 7×24 WhatsApp/WeChat video call if fault codes persist
We reply within 12 h with FOB, CIF or DDP price and a free Excel template that reminds you when the next switch replacement is due.
Conclusion The SEL1-A1Z vice switch is only 6 cm long, yet it holds the entire safety chain together. A worn roller or high-resistance contact can shut down an elevator for hours. Stock a handful of Nanjing Zhuye OEM-grade switches on every service truck, swap them on schedule, and replace “door lock fault” panic with a 30-second planned fix—one safe, confident ride at a time.
