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

3G Electric
Siemens 5SY61066 B-Curve 1-Pole Supplementary Protector - B-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensB-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens 5SY61066 B-Curve 1-Pole Supplementary Protector

The SIEMENS IEC Supplementary Protector is a B-Curve, 1-Pole UL1077 DIN Rail-Mount supplementary protector rated at 6 Amps. Part of the 5SY6 series, it features a Max. AIR Rating of 5kA at 230/400V AC and an AC…

SKU 3G-OTH-20720

Brand
Siemens
Item
5SY61066 B-Curve 1-Pole Supplementary Protector
Part Number
5SY61066
Category
B-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
Available to Order
Also known as:5SY61066Siemens
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

Siemens
Manufacturer Part Number
5SY61066
Series
5SY6
Type
5kA at 230/400V AC, Screw Clamp, 5SY6, B
AC
230/400V
Curve Type
B
Max. AIR Rating
5kA at 230/400V AC
AC Voltage Rating
230/400V AC
DC Voltage Rating
Not Rated
Terminal Connection
Screw Clamp

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

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

Product Description

The SIEMENS IEC Supplementary Protector is a B-Curve, 1-Pole UL1077 DIN Rail-Mount supplementary protector rated at 6 Amps. Part of the 5SY6 series, it features a Max. AIR Rating of 5kA at 230/400V AC and an AC Voltage Rating of 230/400V AC, with a Screw Clamp terminal connection. This device is not rated for DC voltage.

Frequently Asked Questions

What is the SIEMENS 5SY61066 supplementary protector used for?

The SIEMENS 5SY61066 is a B-curve, 1-pole supplementary protector rated at 6 A. It protects branch circuits and equipment against overloads and short circuits in industrial control panels, HVAC systems, and lighting applications. It mounts on a DIN rail and is UL1077 listed for AC systems up to 230/400V AC.

What are the specifications of the SIEMENS 5SY61066?

The SIEMENS 5SY61066 is a 6 A, B-curve supplementary protector with a max. AIR rating of 5kA at 230/400V AC. It has a screw clamp terminal connection, AC voltage rating of 230/400V AC, and is not rated for DC voltage. It is part of the 5SY6 series and mounts on a DIN rail.

Where to buy the SIEMENS 5SY61066 worldwide?

You can source the SIEMENS 5SY61066 through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time on this supplementary protector.

How to install the SIEMENS 5SY61066 supplementary protector?

Install the SIEMENS 5SY61066 by snapping it onto a standard DIN rail. Connect the line and load wires using the screw clamp terminals, tightening to the torque specified on the device label. Ensure the system is de-energized before installation. Follow local electrical codes and the manufacturer's instructions for proper operation.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks
Not sure this is the right part? Photo-identify it

Siemens Products

3G Electric supplies Siemens b-curve, 1-pole ul1077 din rail-mount supplementary protectors. 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 Siemens

View all Siemens parts

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first