CAT 1251302 SWITCH AS for 345C Caterpillar Part - WSTPARTS

Need a dependable Switch/Relay part for your Caterpillar 345C, C18 and 345B machine? The 1251302 SWITCH AS from WSTPARTS is manufactured to OEM-grade tolerances. It is categorized under Switch/Relay. Every unit is fitment-verified before dispatch. Manual reference: 3126B: ELECTRICAL AND STARTING SYSTEM, group 133-3329, page 521; 325C: ELECTRICAL AND STARTING SYSTEM, group 231-1659, page 228.

1251302 SWITCH AS for Caterpillar 345C — Genuine & OEM Replacement Part

WSTPARTS supplies genuine and high-quality OEM replacement SWITCH AS (Part # 1251302). Designed for CAT 345C, C18, 345B, 336D, 325C, 325D, 330C, 330D, 365B, C15, C7, C9, 320C, 345D equipment.

Compatible Models

Key Features

• ✔ 100% compatible with CAT 345C, C18, 345B, 336D, 325C, 325D, 330C, 330D, 365B, C15, C7, C9, 320C, 345D
• ✔ Meets Caterpillar original quality and performance standards
• ✔ Genuine CAT parts with anti-counterfeit label | OEM alternatives with warranty
• ✔ Available for order, contact for lead time

Specifications

Part Number (MPN)	1251302
Product Name	SWITCH AS
Brand	CAT
Applicable Models	345C, C18, 345B, 336D, 325C, 325D, 330C, 330D, 365B, C15, C7, C9, 320C, 345D
Weight	0.23 kg
Condition	New (Genuine / OEM Equivalent)
Warranty	12 Months

Where This Part Fits

Every row below is a real listing of 1251302 in the Caterpillar parts manual: the machine it is published under, the system it belongs to, the group number and the manual page. Use it to confirm the part against your own parts book before ordering.

Machine	System	Group No.	Manual Page
3126B	ELECTRICAL AND STARTING SYSTEM	133-3329	p.521
325C	ELECTRICAL AND STARTING SYSTEM	231-1659	p.228
325D	ELECTRICAL AND STARTING SYSTEM	231-1756	p.175
330D	ELECTRICAL AND STARTING SYSTEM	231-1756	p.176
336D	ELECTRICAL AND STARTING SYSTEM	231-1756	p.182
345B	ELECTRICAL AND STARTING SYSTEM	143-1602	p.189
345C	ELECTRICAL AND STARTING SYSTEM	224-2906	p.171
365B	ELECTRICAL AND STARTING SYSTEM	145-0521	p.162

System Notes — ELECTRICAL AND STARTING SYSTEM

The electrical and starting system covers the battery, starter motor, alternator, wiring harness, relays, switches and the instrument panel. It carries current from the batteries to the starter to crank the engine, and from the alternator back to keep the batteries charged. Because these machines work in dust, vibration and wide temperature swings, connectors corrode, harness insulation chafes against the frame, and starter solenoids burn out from repeated short cranks. Parts in this group are usually replaced on a symptom basis — slow cranking, a dash warning, lights that dim under load, or a no-start condition traced to an open circuit.

System Notes — AIR INLET AND EXHAUST SYSTEM

The air inlet and exhaust system covers the air cleaner housing and elements, intake piping, turbocharger, aftercooler, exhaust manifold, turbo mounting hardware and gaskets. It delivers clean, dense air and carries hot gas away. On this group, the two dominant failures are dust ingress and heat cycling: a leaking intake joint lets unfiltered air straight into the cylinders and dusts the rings in a few hundred hours, while exhaust manifold and turbo flange gaskets crack from repeated heat cycles and start whistling or sooting. Parts are replaced when boost drops, the intake tract shows dust trails past the filter, or a soot streak appears at a joint.

FAQ

Is 1251302 the right part for my machine?
Match the part number on your old part, or send us your equipment serial number — WSTPARTS verifies fitment free of charge for CAT 345C.

Genuine vs OEM replacement — what is the difference?
Genuine CAT parts carry an anti-counterfeit label. OEM equivalents are built to the same specifications, bench-tested and supplied with full warranty at a better price.

Stock, shipping and warranty?
Lead time confirmed on request; we quote the fastest available option. Every order is covered by a 12-month warranty.

📞 Get a Quote: Contact the WSTPARTS parts team | Email: cat@wstparts.com