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 B6.90 Thermal Unit, Trip Class 20 - Electrical
SQUAREElectrical

SQUARE B6.90 Thermal Unit, Trip Class 20

SQUARE Electrical.

SKU 3G-OTH-40197

Also listed as: B690 · B6 90 · B6-90

Brand
SQUARE
Item
B6.90 Thermal Unit, Trip Class 20
Part Number
B6.90
Category
Electrical
UNSPSC
39121029 — Isolation transformer
Available to Order
Also known as:B6.90SQUARE
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
B6.90

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 a Square D thermal unit B6.90 used for?

The Square D thermal unit B6.90 is a trip-class 20 overload relay heater element used in motor starters to protect motors from sustained overcurrent. It is commonly applied in industrial control panels, conveyors, pumps, and HVAC equipment across manufacturing and process industries.

What are the specifications of the Square D thermal unit B6.90?

The Square D thermal unit B6.90 is a trip-class 20 overload relay heater element with manufacturer part number B6.90. It is designed for use with Square D motor starters to provide thermal overload protection. For exact ampere ratings and application matching, consult the Square D selection chart.

Where to buy Square D thermal unit B6.90 worldwide?

3G Electric supplies the Square D thermal unit B6.90 to customers worldwide. As a global industrial sourcing partner, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this overload relay heater element.

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

To select the correct Square D thermal unit, match the motor full-load current (FLC) to the heater element's ampere range from the Square D selection chart. The B6.90 is a trip-class 20 element; verify your motor's service factor and ambient temperature. Always consult the starter manufacturer's documentation for proper sizing.

Used in

Common applications for SQUARE
Industrial power distribution — Square D HU362AWC non-fusible safety switch for disconnecting three-phase loads up to 60 A.
Busway branch circuits — Square D PQ4203G fusible bus plug for overcurrent protection in I-Line busway systems.
Panelboard surge protection — Square D HL4IMA24C SPD for transient voltage suppression in 277/480V AC wye systems.
Power distribution in control panels — Square D 9080LBA263106 open distribution block for splitting 400 kcmil conductors.
Machine control stations — Square D 9001BG303 push-button station for open/close/stop operations in industrial machinery.
Motor starting and protection — Square D 8536SBG2V02H30S NEMA starter for non-reversing three-phase motor control up to 18 A.
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

Compatible alternatives & equivalents

More from SQUARE

View all SQUARE parts

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first