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

3G Electric
Robertshaw Open Class 2 Transformer - Open Class 2 Transformers
RobertshawOpen Class 2 Transformers

Robertshaw Open Class 2 Transformer

<p>The Robertshaw Open Class 2 Transformer (620-503) is a reliable power conversion solution for HVAC and industrial control applications. This model delivers 75 VA with a 120V AC primary input and a 24V AC secondary…

SKU 3G-OTH-49311

Also listed as: 620503 · 620 503

Brand
Robertshaw
Item
Open Class 2 Transformer
Part Number
620-503
Category
Open Class 2 Transformers
Available to Order
Also known as:620-503Robertshaw
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

Robertshaw
Manufacturer Part Number
620-503
AC
24V
Mounting
Plate
Input Voltage
120V AC
Output Voltage
24V AC
Connection - Primary
Wire Lead
Connection - Secondary
Wire Lead
AC/208V AC/240V AC/480V AC
120V

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

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

Product Description

<p>The Robertshaw Open Class 2 Transformer (620-503) is a reliable power conversion solution for HVAC and industrial control applications. This model delivers 75 VA with a 120V AC primary input and a 24V AC secondary output, making it suitable for powering low-voltage control circuits. It features a plate mount design and wire lead connections for both primary and secondary sides, simplifying installation in control panels and equipment.</p><p>As a Singapore-based supplier, 3G Electric offers this transformer with worldwide shipping. For procurement buyers in Singapore, we provide SGD quotes on request and handle GST for local purchases. Enjoy fast delivery across Singapore and Southeast Asia, ensuring your projects stay on schedule.</p>

Frequently Asked Questions

What are the input and output voltages of the Robertshaw 620-503 transformer?

The input voltage is 120V AC, and the output voltage is 24V AC.

How is the transformer mounted and connected?

It is plate mounted, and both primary and secondary connections are wire leads.

Used in

Common applications for Robertshaw
Commercial cooking equipment — Robertshaw 66004-AF80 electric cooking limit control for Whirlpool ovens and fryers, 240 V AC, 1 in stem.
Industrial vibration monitoring — Robertshaw 6000-107 mechanical vibration sensor switch with DPDT contacts, 7 A at 460 V AC, hazardous location rated.
Gas-fired appliance repair — Robertshaw Unitrol button (BLO10318) for gas control assemblies in heating and cooking equipment.
Commercial ovens and griddles — Robertshaw 5225-112 electric limit control with 100 to 450 dial, 30 in capillary, 250 V AC.
Foodservice equipment maintenance — Robertshaw 5502-307M electric cooking control for Nemco applications, 120 V AC, 1 1/8 in stem.
OEM replacement for Electrolux cooking appliances — Robertshaw 66004-AF71 electric limit control, 240 V AC, 3/4 in stem.
Not sure this is the right part? Photo-identify it→

Robertshaw Products

3G Electric supplies Robertshaw open class 2 transformers. 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 Robertshaw

View all Robertshaw parts →
Open Class 2 transformer with foot mounting. Input voltage 240V AC; output voltage 2.5V AC. Wire lead connections on primary and secondary. Commonly used to step down line voltage for low-voltage control circuits in HVAC and industrial equipment
Robertshaw
Open Class 2 transformer with foot mounting. Input voltage 240V AC; output voltage 2.5V AC. Wire lead connections on primary and secondary. Commonly used to step down line voltage for low-voltage control circuits in HVAC and industrial equipment

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first