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Genuine Original Product Ignition Switch Adapter 3774-00090 for Yutong Bus ZK6116 ZK6120 | OEM Engine Electrical Parts

The Ignition Switch (Part No. 3774-00090) is a high-reliability electrical and mechanical control component designed specifically for large Chinese-made passenger buses. As the primary interface between the driver and the vehicle’s power system, this switch controls key electrical modes including LOCK, ACC, ON, and START, enabling secure engine startup and systematic power distribution across auxiliary systems.

Commonly used in fleet-operated coaches, city buses, and intercity transport vehicles, the 3774-00090 is engineered to withstand frequent daily operations, harsh environmental conditions, and prolonged exposure to vibration and dust. It features a robust metal housing, precision lock cylinder, and multi-terminal wiring configuration—ensuring long-term durability and safe ignition sequence execution.
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  • 3774-00090

  • Yutong Bus Parts

Attribute Description
Part Number 3774-00090
Product Name Ignition Switch / Key Start Switch
Application Vehicle Type Large Passenger Buses, Coaches, Electric & Diesel Models
Voltage Rating 24V DC (Standard Commercial Bus System)
Housing Material High-strength metal with anti-corrosion coating
Lock Cylinder Included Yes – includes one lock core and two matching keys
Terminal Configuration Multi-pin plug-in design (typically 4–6 terminals)
Switch Positions (Detents) 4 Positions: LOCK (0), ACC (I), ON (II), START (III)
Mounting Style Flange-mounted with threaded barrel
Protection Level IP54 (Dust protected, splash resistant)
Operating Temperature -40°C to +85°C (-40°F to +185°F)
Compliance Standards GB/T 28046 (Automotive Electronics), CCC, ISO 9001
点火开关-4


点火开关-2


Parameter Specification
Rated Voltage 24V DC
Maximum Current Ratings - Battery (B): 30A continuous
- Ignition (I): 20A
- Starter (S): 15A (momentary, ≤5 sec)
Contact Resistance ≤ 50 mΩ
Insulation Resistance ≥ 100 MΩ at 500V DC
Dielectric Strength 1500V AC for 1 minute (between isolated circuits)
Mechanical Life ≥ 100,000 cycles (key insert/remove + rotation)
Electrical Life ≥ 50,000 cycles (at rated load)
Spring Return Function Automatic return from START → ON after release
Terminal Type Blade terminals (e.g., 6.3mm Faston) or solder tags
Vibration Resistance Complies with GB/T 28046.3 / ISO 16750-3
Anti-Theft Design Precision tumbler lock mechanism; non-duplicable without code


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