140-9378 Relay

CAT 12V 5-Pin Sealed Mini Relay (Universal Type)

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I. Core Specifications

Part Number: 140-9378 / 1409378

Brand: Caterpillar (CAT)

Type: Electromagnetic Mini Relay

Voltage: 12V DC

Pins: 5-Pin

Contacts: Silver alloy contacts; durable and oxidation-resistant

Housing: Fully sealed / Waterproof (Polyurethane material)

Dimensions: Length 26.2mm × Width 15.5mm × Height 37.1mm

Function: Single Pole Double Throw (SPDT); controls fans, lights, fuel pumps, solenoid valves, etc.

II. Applicable Models

Excavators

320C / 320D / 324D / 325D / 329D / 330C / 330D / 336D / 345D

E320D / E330D

Loaders / Dozers / Compactors

938G / 950G / 962G / 966G / 972G / 980G

D5N / D6N / D6R

CS-533 / CS-563 / CP-573

Engines

3054C / 3066 / 3126B / 3176C / 3196 / 3406E / C7 / C9 / C15

III. Alternative Models

Direct Interchange: 146-9439 (CAT 12V relay with identical specifications)

Universal Alternative: 8-97173-109-0 (Isuzu), 15670-02Z01 (Nissan), VDO 24V (Pin-Compatible)

IV. Features and Applications

Fully Sealed: Dustproof, waterproof, and oil-resistant; suitable for the harsh environments of heavy machinery.

Silver Contacts: Excellent conductivity, long service life, and minimal arcing.

Universal 5-Pin Configuration:

Coil: 85 / 86

Normally Open (NO): 87

Normally Closed (NC): 87a

Common: 30