Product Overview — 4N3890
Overview
Contactor/Relay 4N3890 is a commonly used spare part in construction machinery. We can supply all the original and replacement part numbers listed below, in stock or available on order — welcome to enquire by part number.
Applicable Models & Applications
This contactor or relay is used in the electrical circuit of Caterpillar machines, switching the rated load without overheating. Suitable for the corresponding machine model and configuration — please verify the machine model, serial number and part number match before ordering.
Maintenance & Replacement
Inspect contactor and relay contacts, coil resistance and mounting at service time; replace a contactor with pitted or burnt contacts rather than cleaning them repeatedly. Early signs it may need attention: Intermittent operation — a circuit that drops out when hot or under vibration; A chattering contactor that makes equipment control unsteady; Burnt, welded or corroded contacts that fail to make/break the load cleanly.
Installation Essentials
Work on a clean machine with the engine off and the relevant system drained or depressurised as required, and confirm the part number against your machine model and serial number before ordering. Confirm coil voltage and contact rating against your control circuit. Size cable lugs correctly and torque the terminals to avoid hot joints. After installation, run the machine and check for leaks, unusual noise or abnormal travel before returning it to service, and retighten where the manual calls for it after the first hours of operation.
Reference Price
The reference price for this Contactor/Relay (listed under 4N3890) is approximately USD 15 – 40 per unit, depending on configuration, quantity and shipping destination. This is an estimate for planning purposes — please confirm current pricing and availability with our sales team before ordering.
Available Part Numbers
- 4N3890
Also in the Contactor/Relay Series
Same-series, real numbers we also supply (always confirm fit and interchange against your machine): 1500-24AS1U1
Buy the right Contactor/Relay the first time — Racer Machinery confirms fit against your machine before dispatch and backs every order with inspected, verified parts. Send your part number and model for live stock and pricing.
