Description

Elevator Relay G2R-2-SND(S) – Usage, Replacement Cycle & Maintenance Guide
By Nanjing Zhuye Elevatorparts

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Introduction
The G2R-2-SND(S) is a high-reliability, silver-nickel contact relay designed specifically for elevator safety chains, door circuits, and control logic. Manufactured and distributed worldwide by Nanjing Zhuye Elevatorparts, this DIN-rail mounted relay meets EN 81-20/50 and ASME A17.1 standards, delivering over 1 million electrical cycles. This 800-word guide explains correct installation, daily operation, and the recommended replacement cycle to keep every lift running safely and efficiently.

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1. Product Highlights
– Contacts: 2-pole change-over (2 CO), 8 A @ 250 V AC
– Coil: 24 V DC, 0.9 W, polarity-free, with LED indicator
– Material: Silver-nickel (AgNi) contacts, self-extinguishing PBT housing
– Rating: 1 million+ electrical cycles, 10 million mechanical cycles
– Standards: CE, UL, RoHS, REACH compliant
– Ambient: –40 °C to +70 °C, 95 % RH non-condensing

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2. Installation Method
Step 1 – Preparation
De-energise the control cabinet; lock-out/tag-out main breaker. Record coil voltage and contact code from the label.

Step 2 – Mounting
Snap relay onto 35 mm DIN rail; ensure ≥30 mm clearance for airflow. Earth rail must be connected to PE.

Step 3 – Wiring
• Safety-chain: use CO contact, wire NC terminal to controller “fault” input.
• Coil: 24 V DC ±10 %, 0.9 W; ferrule crimp 0.5 mm², torque 0.6 N·m.
• Route coil and contact cables separately to avoid EMI.

Step 4 – Commissioning
Power-up; LED must illuminate. Cycle contact 20×; verify <5 mΩ contact resistance and <50 ms operate/release time.

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3. Daily & Preventive Maintenance
Daily (Technician)
Visual check—LED green, no arcing sound. Ensure coil voltage within 24 V ±10 %.

Monthly
Clean relay housing; check DIN-rail latch tightness. Measure contact resistance (<5 mΩ).

Quarterly
Cycle contact 100× under load; inspect for pitting or discoloration. Tighten terminal screws.

Annually
Insulation test (>100 MΩ @ 500 V DC). Replace relay if coil current >40 mA or contact wear visible.

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4. Replacement Cycle & Indicators
| Duty Cycle | Replace Every | Cycles | Warning Signs |
| Standard residential | 7–8 years | 1 M | Contact pitting, >10 mΩ |
| Commercial / hospital | 4–5 years | 0.6 M | Coil >40 mA, LED dim |
| Freight / high-speed | 2–3 years | 0.3 M | Arcing, housing crack |

Replace immediately if:
• Contact welding or insulation <50 MΩ
• Coil open-circuit or LED off
• Repeated “relay fault” logs without external cause

Stock 1 spare per 25 relays for <4-hour response.

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5. Why Choose Nanjing Zhuye Elevatorparts?
• Full traceability—laser-etched serial & QR code on every relay
• Same-day global dispatch via DHL/FedEx Express
• 24/7 multilingual hotline and on-site training
• Tiered OEM pricing and custom coil voltages (12 V, 48 V, 110 V)

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6. Conclusion
The G2R-2-SND(S) relay is small but mission-critical. By following the installation, testing, and replacement guidelines—and sourcing only from Nanjing Zhuye Elevatorparts—you guarantee code compliance, reduce downtime, and protect every passenger who rides the lift.