NEW Summer 2026 SuperGear! SuperPoints Accepted »

Zinsco / Sylvania SJK-3C-350 - 350A 3 Pole Molded Case Circuit Breaker

Brand Zinsco / Sylvania
SKU SJK-3C-350

Zinsco / Sylvania SJK-3C-350 - 350A 3 Pole Molded Case Circuit Breaker

Brand Zinsco / Sylvania
SKU SJK-3C-350
Select Item Condition
Earn 646 SuperPoints

Quantity
Planning a Big Order?
Bulk pricing available—let us know your needs for a quote.
Get a quote
Shop with Confidence
Enjoy a free 60-day warranty, extendable to 1 year at checkout.
Learn more

Zinsco / Sylvania SJK-3C-350 - 350A 3 Pole Molded Case Circuit Breaker

Re-Certified

$646.05 No stock

Quantity

DescriptionSpecificationsSuperClubWarranties
Description
Operating as a crucial safety component for industrial facilities, this 350A thermal-magnetic breaker delivers reliable LI protection. The unit accommodates large wiring, making it highly adaptable for heavy commercial loads. It fastens securely into legacy Challenger, Westinghouse, and Sylvania panelboards to keep older systems running smoothly. When sourcing modern equivalents, the Eaton KD3350 serves as the replacement path. A 30kA rating at 480VAC ensures superior defense against faults.

Specifications

Brand Zinsco / Sylvania
Series SJK
Part Number SJK-3C-350-R
Amperage 350A
Voltage 600VAC
Poles 3
Phase 3
AIC Rating 65kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC
Mounting Style Bolt-On
Terminal Type Lugs
For Use With Sylvania Panelboards, Challenger Panelboards, Westinghouse Panelboards, Eaton Panelboards
Trip Technology Thermal Magnetic
Trip Function Code LI
Trip Function Long-Time, Instantaneous
Trip Adjustability Fixed Thermal, Adjustable Magnetic
Wire Gauge 3/0 AWG - 500 kcmil (Al/Cu)
Max Wire 500 kcmil
Min Wire 3/0 AWG
Available Options Shunt Trip, Auxiliary Switch, Undervoltage Release, Lug Kits
Accessories Lugs Not Included
Standards UL 489, NEMA AB 1
Approval UL
Temp Rating 40°C
Construction Features Interchangeable Trip Unit

SuperClub

Get rewarded every time you shop! Join SuperClub for free and start earning points on every purchase, unlocking exclusive discounts, special promos, and VIP perks. Already a member? Keep shopping to level up your rewards and enjoy even more benefits, including faster shipping, extended returns, and premium offers.

Learn more about SuperClub

Warranties

We’ve got you covered!

When shopping with SuperBreakers, you’ll have peace of mind knowing that every single item you purchase includes a 60 day warranty, free of charge. Why such confidence? Because only the highest quality electrical parts have a place on our shelves, and we stand by every single one we sell.

If anything goes wrong with your item that is not a result of misuse or normal wear and tear, we’ll gladly replace it at no cost to you.

Click here to read our full warranty details

Shipping

Free Shipping Policy

Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.

Click here to read our full shipping policy
Same Day Shipping

We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments

Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping

All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.

Related Products

Recently Viewed