Description

1. Full Supply Chain For Otis, Kone, Schindler, Mitsubishi, Thyssenkrupp Elevator Lift  and Escalator All Brand Spare Parts

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4. Huge Customer From European

1. Decoding BR27C A311
   BR27C is the universal 27 mm square lattice that snaps into 30 × 30 mm European and 25 × 33 mm Asian faceplates.
   A311 breaks down as:
   A = flush square cap (2.2 mm projection)
   3 = white symbol on opaque black background
   1 = 12 VDC warm-white LED (other codes: 2 = red, 3 = blue)
   1 = gold-plated micro-switch, 1 A 250 VAC, 3 mm travel
   The result is a vandal-resistant, 1 million-cycle, IP54-rated button that draws only 18 mA—low enough to keep EN-81 standby consumption happy.
2. Where BR27C A311 Is Used
   Passenger car operating panels (COP)
   Landing operation panels (LOP) with 30 mm pitch
   Hydraulic or traction controllers that supply 12–24 VDC for LED and dry-contact signal back to the board
   Simplex or group installations up to 64 floors
3. Installation – 180-Second Swap
   Safety first: place controller on INSPECTION, lock main breaker, tag out.
   Step 1 – Pop out failed button with plastic spudger; disconnect 2-pin JST LED plug and 4-pin micro-switch plug.
   Step 2 – Inspect the socket for cracks; if latch ears are broken, replace the entire 30 × 30 housing (Nanjing Zhuye part HZ-30-ABS).
   Step 3 – Snap the new BR27C A311 into the square hole until you hear two clicks—diagonal tug test >20 N.
   Step 4 – Connect LED plug: polarity is marked “+” on red wire; reverse will not damage LED but it will not light.
   Step 5 – Connect micro-switch: common (C) and normally-open (NO) for momentary call; short C to NC if you need a “door-close” maintained signal.
   Step 6 – Power up, release inspection, press button five times—verify controller logs correct call and LED stays solid for 3 s after release.
   No software, no laptop, no parameter reset—true plug-and-play.
4. Daily Use – What the Passenger Feels
   Tactile force 3.8 N ± 0.5 N, the “sweet spot” for gloved or elderly users
   1.2 mm pre-travel, 0.8 mm over-travel—prevents finger fatigue on high-rise banks
   Flush cap resists graffiti; permanent marker wipes off with isopropyl
   LED brightness 220 cd m⁻², visible under 6 000 lux mall lighting yet dimmable to 30 % for midnight energy codes
5. Replacement Cycle & Preventive Maintenance
   High-traffic office (>1 500 starts per day) – inspect quarterly, replace button every 24 months
   Residential tower (400–800 starts per day) – inspect every 6 months, replace every 4 years
   Low-use freight or villa lift (≤200 starts per day) – inspect annually, replace every 6 years
   Replace immediately if:
   LED lumen maintenance <70 % (symbol looks grey)
   Tactile force drops below 2 N (no “click” felt)
   Contact resistance >100 mΩ at 1 A (controller logs intermittent “false call”)
   Cap cracked or symbol worn to less than 50 % dot area (vandal image risk)
6. Extending Life – Three Pro Tips from Nanjing Zhuye
7. Keep supply voltage 12 VDC ±5 %; 15 V spikes halve LED life
8. Clean faceplate with 70 % isopropyl, not ammonia glass spray—prevents lens crazing
9. In coastal cities, apply optional silicone boot (IP65) to stop salt fog creeping into micro-switch
10. Why Source BR27C A311 from Nanjing Zhuye Elevator Parts?
    Exact OEM lattice 27.0 mm ±0.05 mm, no re-machining needed
    Gold-plated contacts rated 1 million cycles—lab tested, report provided
    Dual warehouses: 22 000 pcs in Nanjing, 8 000 pcs in Dubai—2-day DHL to 62 countries
    Bundle kit: button + 30 cm flying lead + socket for 5 % less than single OEM piece
    Warranty: 24 months replacement, no return-to-factory delay
    Tech support: 7×24 WhatsApp/WeChat group, average response 11 minutes

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