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 5SY4 Series A-Curve 1-Pole Supplementary Protector - A-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensA-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens 5SY4 Series A-Curve 1-Pole Supplementary Protector

The Siemens 5SY4 series IEC supplementary protector is a 1-pole, A-curve, DIN rail-mount device rated at 1.6 A. It carries a maximum AIR rating of 10kA at 230/400V AC and a DC voltage rating of 72V DC, with screw…

SKU 3G-OTH-21475

Brand
Siemens
Item
5SY4 Series A-Curve 1-Pole Supplementary Protector
Part Number
5SY41155
Category
A-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
Available to Order
Also known as:5SY41155Siemens
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
5SY41155
Series
5SY4
Type
10kA at 230/400V AC, Screw Clamp, 5SY4, A
DC
72V
Curve Type
A
Max. AIR Rating
10kA at 230/400V AC
AC Voltage Rating
230/400V AC
DC Voltage Rating
72V DC
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 5SY4 series IEC supplementary protector is a 1-pole, A-curve, DIN rail-mount device rated at 1.6 A. It carries a maximum AIR rating of 10kA at 230/400V AC and a DC voltage rating of 72V DC, with screw clamp terminals. This UL1077-listed supplementary protector (MPN 5SY41155) is designed for branch circuit protection in industrial control panels.

Frequently Asked Questions

What is the Siemens 5SY41155 supplementary protector used for?

The Siemens 5SY41155 is an A-curve, 1-pole supplementary protector rated at 1.6 A. It provides branch circuit protection in industrial control panels, safeguarding wiring and components against overloads and short circuits. Its UL1077 listing makes it suitable for use in machinery and panel-building applications worldwide.

What are the specifications of the Siemens 5SY41155?

The Siemens 5SY41155 is a 1-pole supplementary protector with a 1.6 A rating, A-curve trip characteristic, and screw clamp terminals. It has a max AIR rating of 10kA at 230/400V AC and a DC voltage rating of 72V DC. It is part of the 5SY4 series and is UL1077 listed for DIN rail mounting.

Where to buy the Siemens 5SY41155 worldwide?

3G Electric supplies the Siemens 5SY41155 supplementary protector to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this UL1077-listed 1.6 A, A-curve device.

How to install the Siemens 5SY41155 supplementary protector?

Install the Siemens 5SY41155 on a standard DIN rail in a control panel. Ensure the circuit is de-energized before wiring. Connect conductors to the screw clamp terminals per the torque specifications in the datasheet. The A-curve characteristic is ideal for protecting sensitive electronic loads from short circuits and overloads.

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 a-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