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Siemens 5SY43057 C-Curve 3-Pole Supplementary Protector - C-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensC-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens 5SY43057 C-Curve 3-Pole Supplementary Protector

The SIEMENS IEC Supplementary Protector (SKU 5SY43057, MPN 5SY43057) is a C-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protector rated at 0.5 A Amps. It features a Max. AIR Rating of 10kA at 400V AC, AC…

SKU 3G-OTH-19994

Brand
Siemens
Item
5SY43057 C-Curve 3-Pole Supplementary Protector
Category
C-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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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
5SY43057
Series
5SY4
Type
10kA at 400V AC, Screw Clamp, 5SY4
AC
400V
DC
72V
Max. AIR Rating
10kA at 400V AC
AC Voltage Rating
400V AC
DC Voltage Rating
72V DC
Terminal Connection
Screw Clamp

Technical Documents

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

Product Description

The SIEMENS IEC Supplementary Protector (SKU 5SY43057, MPN 5SY43057) is a C-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protector rated at 0.5 A Amps. It features a Max. AIR Rating of 10kA at 400V AC, AC Voltage Rating of 400V AC, and DC Voltage Rating of 72V DC, with a Screw Clamp terminal connection from the 5SY4 series.

Frequently Asked Questions

What is the SIEMENS 5SY43057 supplementary protector used for?

The SIEMENS 5SY43057 is a C-Curve, 3-Pole UL1077 DIN Rail-Mount supplementary protector rated at 0.5 A Amps. It protects industrial control circuits, HVAC equipment, and automation systems from overcurrent and short circuits in 400V AC or 72V DC applications.

What are the specifications of the SIEMENS 5SY43057?

The SIEMENS 5SY43057 is a 0.5 A Amp, C-Curve, 3-Pole supplementary protector from the 5SY4 series. It has a Max. AIR Rating of 10kA at 400V AC, AC Voltage Rating of 400V AC, DC Voltage Rating of 72V DC, and a Screw Clamp terminal connection.

Where to buy the SIEMENS 5SY43057 worldwide?

You can source the SIEMENS 5SY43057 supplementary protector through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations, ensuring reliable supply for your facility.

How to install the SIEMENS 5SY43057 supplementary protector?

Install the SIEMENS 5SY43057 on a DIN rail by snapping it into place. Connect wires to the Screw Clamp terminals, ensuring proper torque per manufacturer guidelines. Verify the circuit is de-energized before installation and test for correct polarity in DC applications.

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, 3-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.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
SIEMENS IEC Supplementary Protector: 5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43117)
Siemens
SIEMENS IEC Supplementary Protector: 5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43117)
SIEMENS IEC Supplementary Protector: 15 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43187)
Siemens
SIEMENS IEC Supplementary Protector: 15 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43187)
SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43157)
Siemens
SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43157)
This 3-pole supplementary protector from the Siemens 5SY4 series features a C-curve trip characteristic and a rated current of 0.3 A. It is designed for DIN rail mounting and provides overcurrent protection with a maximum interrupting rating of 10kA at 400V AC. The unit accepts AC voltages up to 400V and DC voltages up to 72V, with screw clamp terminals for secure wiring. Typical applications include protection of branch circuits and equipment in industrial control panels, HVAC systems, and automation installations
Siemens
This 3-pole supplementary protector from the Siemens 5SY4 series features a C-curve trip characteristic and a rated current of 0.3 A. It is designed for DIN rail mounting and provides overcurrent protection with a maximum interrupting rating of 10kA at 400V AC. The unit accepts AC voltages up to 400V and DC voltages up to 72V, with screw clamp terminals for secure wiring. Typical applications include protection of branch circuits and equipment in industrial control panels, HVAC systems, and automation installations
SIEMENS IEC Supplementary Protector: 2 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43027)
Siemens
SIEMENS IEC Supplementary Protector: 2 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43027)
SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43037)
Siemens
SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY43037)

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This 3-pole supplementary protector from the Siemens 5SY4 series features a C-curve trip characteristic and is UL1077 listed. Rated 10A at 400V AC or 72V DC with a maximum interrupting rating of 10kA at 400V AC, it uses screw clamp terminals for wiring. Designed for DIN rail mounting, it is used for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels, HVAC systems, and machinery
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Siemens 5SY6 series supplementary protector, 3-pole, C-curve, rated 20A at 400V AC with 5kA interrupting capacity. UL1077 listed for DIN rail mounting. Screw clamp terminals. Suitable for branch circuit and equipment protection in industrial control panels, HVAC, and machinery applications
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This 3-pole supplementary protector from the Siemens 5SY4 series features a C-Curve trip characteristic and is UL1077 recognized. Rated 13A with AC voltage 400V and DC voltage 72V, it provides overcurrent and short-circuit protection for branch circuits and equipment. The maximum interrupting rating is 10kA at 400V AC. Terminal connections are screw clamp type, and the unit mounts on DIN rail. Typical applications include industrial control panels, HVAC systems, and automation equipment
This 3-pole supplementary protector from the Siemens 5SY4 series features a C-curve trip characteristic and a rated current of 63 A. It is designed for DIN-rail mounting and provides overcurrent and short-circuit protection in branch circuits and equipment. The unit has an AC voltage rating of 400V AC and a DC voltage rating of 72V DC, with a maximum interrupting rating of 10kA at 400V AC. Terminal connections are made via screw clamps
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This 3-pole supplementary protector from the Siemens 5SY4 series features a C-curve trip characteristic and a rated current of 63 A. It is designed for DIN-rail mounting and provides overcurrent and short-circuit protection in branch circuits and equipment. The unit has an AC voltage rating of 400V AC and a DC voltage rating of 72V DC, with a maximum interrupting rating of 10kA at 400V AC. Terminal connections are made via screw clamps
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3-pole supplementary protector with C-curve trip characteristic, rated 16 A. AC voltage rating 400 V, DC voltage rating 72 V, with a maximum interrupting rating of 10 kA at 400 V AC. Screw clamp terminals. Suitable for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels and automation systems
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