Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
SQUARE D B25.0 Thermal Unit, 20 Trip Class - Electrical
SQUAREElectrical

SQUARE D B25.0 Thermal Unit, 20 Trip Class

SQUARE Electrical.

SKU 3G-OTH-41187

Also listed as: B250 · B25 0 · B25-0

Brand
SQUARE
Item
D B25.0 Thermal Unit, 20 Trip Class
Part Number
B25.0
Category
Electrical
UNSPSC
39121029 — Isolation transformer
Available to Order
Also known as:B25.0SQUARE
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

SQUARE
Manufacturer Part Number
B25.0

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

SQUARE Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

SQUARE Electrical.

Frequently Asked Questions

What is the SQUARE D B25.0 thermal unit used for?

The SQUARE D B25.0 thermal unit is an overload relay heater element designed for motor protection in industrial electrical panels. It trips when current exceeds the rated threshold, preventing motor damage from sustained overloads. Common applications include conveyors, pumps, and HVAC systems where reliable thermal protection is required.

What are the specifications of the SQUARE D B25.0 thermal unit?

The SQUARE D B25.0 thermal unit has a trip class of 20 and a manufacturer part number of B25.0. It is designed for use with SQUARE D motor starters and contactors. The trip class indicates the maximum time in seconds the unit can withstand a locked-rotor current before tripping, ensuring motor protection.

Where to buy SQUARE D B25.0 thermal units worldwide?

3G Electric supplies the SQUARE D B25.0 thermal unit worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead times. We source genuine SQUARE D components for reliable motor protection.

How to select the correct SQUARE D thermal unit for a motor?

To select the correct SQUARE D thermal unit, match the heater element's trip class and current rating to your motor's full-load amperage and starting characteristics. The B25.0 is a trip class 20 unit, suitable for standard motor starts. Always consult the motor nameplate and SQUARE D selection tables to ensure proper overload protection.

Used in

Common applications for SQUARE
Commercial building lighting control — Square D 8903LO60V04 (6-pole, 30 A, 277V AC coil) for switching large-area lighting in offices and retail spaces.
Warehouse lighting — Square D 8903LO1000V02 (10-pole, 30 A, 120V AC coil) for centralized control of high-bay lighting circuits.
Parking lot lighting — Square D 8903SPO2V04 (3-pole, 60 A, 277V AC coil) for remote switching of exterior lighting groups.
Manufacturing facility lighting — Square D 8903LO1200V02 (12-pole, 30 A, 120V AC coil) for multi-circuit lighting control in production areas.
Industrial facility lighting — Square D 8903SMO2V02 (3-pole, 30 A, 120V AC coil) for switching lighting in small zones or individual rooms.
Large-scale lighting systems — Square D 8903LO80V02 (8-pole, 30 A, 120V AC coil) for controlling multiple lighting circuits from a single point.
Not sure this is the right part? Photo-identify it→

SQUARE Products

3G Electric supplies SQUARE electrical. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from SQUARE

View all SQUARE parts →

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first