Skip to product information
12_4ab0ccf1-d05c-4df7-b6e0-23246e281d7b - Northline Parts

Solenoid Power Relay 12V 4 Terminal 5122140 SO51221 SBJ4201

SKU: NLT2T04022
$89.09 In Stock
$89.09
Sale price  $89.09 Regular price 
Ships for free in 2–4 business days.
This is a new replacement power solenoid relay for 12-volt equipment using a 4-terminal power solenoid matching 5122140 / SO51221 / SBJ4201. It is built for the listed application and is a practical replacement when the original part is worn, damaged, or no longer working correctly, replacing reference numbers 5122140, SO51221, SBJ4201.
Estimated delivery between
Shop at Northline Parts Best Customer Service Best Online Parts

Let Northline Parts Do the Heavy Lifting for You!

Not sure which part you need? Our team can help you find the right replacement.

Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT

Live Chat: Available 24/7

I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks

Edward H. — Verified customer

Compatible Models

We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.

Compatible equipment / model
  • Applications using 5122140
  • Applications using SO51221
  • Applications using SBJ4201

Product Overview

If 12-volt equipment using a 4-terminal power solenoid matching 5122140 / SO51221 / SBJ4201 will crank but will not keep running, refuses to shut down correctly, or only works when the solenoid is manually moved or tapped, the stop/fuel solenoid circuit deserves attention.

Verify battery voltage, grounds, connector condition, and the control signal before replacing the component. A failed coil or sticking plunger can prevent the fuel system from moving cleanly between run and stop positions.

Key Features & Performance

  • New aftermarket power solenoid relay for the listed application
  • Designed to replace the original component without changing the machine's basic system layout
  • Built for dependable service in agricultural, construction, industrial, or power-equipment use as applicable

Replaces Part Numbers

  • 5122140
  • SO51221
  • SBJ4201

Common Uses

  • Replacing a worn or failed power solenoid relay
  • Repairing equipment that shows the related operating symptoms described above
  • Restoring dependable operation during scheduled repair or overhaul work

Technical Specifications

  • Product Type: Power Solenoid Relay
  • Condition: New aftermarket replacement
  • Voltage: 12V
  • Terminals: 4

Installation & Fitment

  • Match the original part number whenever it is available
  • Compare mounting points, connectors, ports, shaft style, or gasket pattern with the original component
  • Use the machine serial number and engine model when the manufacturer lists serial-number breaks

Compatibility Notice

Parts can vary by engine, serial number, production date, or equipment configuration. Verify the original component and machine information before ordering.

Frequently Asked Questions

Q: What should I check before ordering? A: Match the original part number and compare the mounting, connections, and application information with the part currently on the machine.

Q: Is this a genuine OEM part? A: No. This is a new aftermarket replacement. Brand names and OE numbers are used only to identify the intended application.

Part Summary

keywords: power solenoid relay, 12-volt equipment using a 4-terminal power solenoid matching 5122140 / so51221 / sbj4201, 5122140, so51221, sbj4201

Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.

Customers also purchased