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

3G Electric
RFQ CartGet a QuoteSign inSign up
Siemens Supplementary Protector: 0.5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp - C-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensC-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens Supplementary Protector: 0.5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp

The SIEMENS IEC Supplementary Protector (SKU 5SY44057, MPN 5SY44057) is a C-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protector from the 5SY4 series, rated at 0.5 A Amps. It features a maximum AIR rating of…

SKU 3G-OTH-20558

Brand
Siemens
Item
Supplementary Protector: 0.5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp
Category
C-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
Available to Order
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
5SY44057
Series
5SY4
Type
10kA at 400V AC, Screw Clamp, C
AC
400V
DC
72V
Max. AIR Rating
10kA at 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 IEC Supplementary Protector (SKU 5SY44057, MPN 5SY44057) is a C-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protector from the 5SY4 series, rated at 0.5 A Amps. It features a maximum AIR rating of 10kA at 400V AC, a DC voltage rating of 72V DC, and screw clamp terminal connections.

Frequently Asked Questions

What is the SIEMENS 5SY44057 supplementary protector used for?

The SIEMENS 5SY44057 is a C-curve, 4-pole supplementary protector rated 0.5 A. It protects branch circuits and sensitive equipment against overloads and short circuits in industrial control panels, HVAC systems, and machinery, with a 72V DC rating and 10kA interrupting capacity at 400V AC.

What are the specifications of the SIEMENS 5SY44057?

The SIEMENS 5SY44057 is a 5SY4 series supplementary protector with 0.5 A current rating, C-curve trip characteristic, 4 poles, 72V DC voltage rating, 10kA max AIR at 400V AC, and screw clamp terminals. It is UL1077 listed for DIN rail mounting.

Where to buy the SIEMENS 5SY44057 worldwide?

3G Electric supplies the SIEMENS 5SY44057 supplementary protector to customers worldwide. As a global industrial sourcing partner, we handle full logistics, customs clearance, and delivery to your facility. Contact us for pricing and lead time on this 0.5 A, 4-pole protector.

How to install the SIEMENS 5SY44057 on a DIN rail?

To install the SIEMENS 5SY44057, snap it onto a standard 35 mm DIN rail. Ensure the rail is clean and the protector is oriented correctly. Use a screwdriver to tighten the screw clamp terminals to the recommended torque for your wire gauge. Always de-energize the circuit before installation.

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

Siemens Products

3G Electric supplies Siemens c-curve, 4-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 →

Compatible alternatives & equivalents

Cross-referenced by specification & description
SIEMENS IEC Supplementary Protector: 16 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44167)
Siemens
SIEMENS IEC Supplementary Protector: 16 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44167)
SIEMENS IEC Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44207)
Siemens
SIEMENS IEC Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44207)
SIEMENS IEC Supplementary Protector: 63 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44637)
Siemens
SIEMENS IEC Supplementary Protector: 63 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44637)
SIEMENS IEC Supplementary Protector: 25 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44257)
Siemens
SIEMENS IEC Supplementary Protector: 25 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44257)
SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44047)
Siemens
SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44047)
SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44037)
Siemens
SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44037)

More from Siemens

View all Siemens parts →
Siemens 5SY4 series supplementary protector with C-curve trip characteristic, 4 poles, rated 1 A. Suitable for AC 400 V and DC 72 V systems with a maximum interrupting rating of 10 kA at 400 V AC. Features screw clamp terminals and DIN rail mounting. Used for overload and short-circuit protection in branch circuits and control equipment
Siemens
Siemens 5SY4 series supplementary protector with C-curve trip characteristic, 4 poles, rated 1 A. Suitable for AC 400 V and DC 72 V systems with a maximum interrupting rating of 10 kA at 400 V AC. Features screw clamp terminals and DIN rail mounting. Used for overload and short-circuit protection in branch circuits and control equipment
C-curve, 4-pole supplementary protector rated 6 A, 400 V AC (72 V DC), with 10 kA interrupting capacity at 400 V AC. Screw clamp terminals. UL1077 listed for DIN-rail mounting. Used for overload and short-circuit protection in branch circuits and equipment
Siemens
C-curve, 4-pole supplementary protector rated 6 A, 400 V AC (72 V DC), with 10 kA interrupting capacity at 400 V AC. Screw clamp terminals. UL1077 listed for DIN-rail mounting. Used for overload and short-circuit protection in branch circuits and equipment
This 4-pole supplementary protector from the Siemens 5SY4 series features a C-trip curve and is rated for 40 A at 400 V AC (10 kA interrupting capacity) and 72 V DC. It uses screw clamp terminals and is designed for DIN rail mounting. Typical applications include overcurrent and short-circuit protection in industrial control panels, HVAC equipment, and automation systems
Siemens
This 4-pole supplementary protector from the Siemens 5SY4 series features a C-trip curve and is rated for 40 A at 400 V AC (10 kA interrupting capacity) and 72 V DC. It uses screw clamp terminals and is designed for DIN rail mounting. Typical applications include overcurrent and short-circuit protection in industrial control panels, HVAC equipment, and automation systems
Supplementary protector with C-curve trip characteristic, rated 8 A, 400 V AC (10 kA interrupting capacity) and 72 V DC. Four-pole design with screw clamp terminals for DIN rail mounting. Suitable for branch circuit and equipment protection in control panels and automation systems
Siemens
Supplementary protector with C-curve trip characteristic, rated 8 A, 400 V AC (10 kA interrupting capacity) and 72 V DC. Four-pole design with screw clamp terminals for DIN rail mounting. Suitable for branch circuit and equipment protection in control panels and automation systems
4-pole supplementary protector with C-curve trip characteristic, rated 1.6 A. Provides overcurrent protection in industrial control panels and equipment. Rated for 400V AC with 10kA interrupting capacity and 72V DC. Screw clamp terminals for secure wiring
Siemens
4-pole supplementary protector with C-curve trip characteristic, rated 1.6 A. Provides overcurrent protection in industrial control panels and equipment. Rated for 400V AC with 10kA interrupting capacity and 72V DC. Screw clamp terminals for secure wiring
Supplementary protector from the Siemens 5SY4 series, rated 2 A with C-curve trip characteristic. Four-pole design for 400V AC (10kA interrupting capacity) and 72V DC systems. Screw clamp terminals for secure wiring. Suitable for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels, HVAC systems, and automation applications
Siemens
Supplementary protector from the Siemens 5SY4 series, rated 2 A with C-curve trip characteristic. Four-pole design for 400V AC (10kA interrupting capacity) and 72V DC systems. Screw clamp terminals for secure wiring. Suitable for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels, HVAC systems, and automation applications
SIEMENS IEC Supplementary Protector: 50 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44507)
Siemens
SIEMENS IEC Supplementary Protector: 50 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44507)
SIEMENS IEC Supplementary Protector: 10 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44107)
Siemens
SIEMENS IEC Supplementary Protector: 10 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, C, 400V AC (MPN 5SY44107)