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Siemens Supplementary Protector: 25 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp - D-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensD-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens Supplementary Protector: 25 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp

The Siemens 5SY4 series IEC supplementary protector is a 25 A, D-curve, 1-pole UL1077 DIN rail-mount device. It is rated for 10kA at 230/400V AC and 72V DC, with screw-clamp terminals. This supplementary protector…

SKU 3G-OTH-20468

Brand
Siemens
Item
Supplementary Protector: 25 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp
Category
D-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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Technical Specifications

Siemens
Manufacturer Part Number
5SY41258
Series
5SY4
Type
10kA at 230/400V AC, Screw Clamp, 5SY4, D
DC
72V
Curve Type
D
Max. AIR Rating
10kA at 230/400V AC
AC Voltage Rating
230/400V AC
DC Voltage Rating
72V DC
Terminal Connection
Screw Clamp
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Siemens 5SY4 series IEC supplementary protector is a 25 A, D-curve, 1-pole UL1077 DIN rail-mount device. It is rated for 10kA at 230/400V AC and 72V DC, with screw-clamp terminals. This supplementary protector provides overcurrent protection for industrial control circuits and equipment.

Frequently Asked Questions

What is the Siemens 5SY41258 supplementary protector used for?

The Siemens 5SY41258 is a 25 A, D-curve supplementary protector used for overcurrent protection in industrial control circuits and equipment. It is commonly applied in panel building, machine control, and automation systems where branch-circuit protection is not required but component safeguarding is needed.

What are the specifications of the Siemens 5SY41258?

The Siemens 5SY41258 is a 1-pole, D-curve supplementary protector rated 25 A, 10kA at 230/400V AC, and 72V DC. It features screw-clamp terminals and mounts on a DIN rail. This UL1077 device is part of the Siemens 5SY4 series, designed for industrial overcurrent protection.

Where to buy the Siemens 5SY41258 worldwide?

You can source the Siemens 5SY41258 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; we supply genuine Siemens supplementary protectors to industrial buyers globally.

How to install the Siemens 5SY41258 supplementary protector?

Install the Siemens 5SY41258 by snapping it onto a 35 mm DIN rail. Ensure the circuit is de-energized. Connect wires to the screw-clamp terminals using the specified torque. The D-curve trips between 10x and 20x rated current, suitable for high-inrush loads. Follow Siemens installation guidelines for safe 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

Siemens Products

3G Electric supplies Siemens d-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.

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SIEMENS IEC Supplementary Protector: 13 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, D (MPN 5SY41138). Key specifications — Brand: SIEMENS; Terminal Connection: Screw Clamp; DC Voltage Rating: 72V DC; Max. AIR Rating: 10kA at 230/400V AC; Series: 5SY4; AC Voltage Rating: 230/400V AC; Curve Type: D.
SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, D (MPN 5SY41158). Key specifications — Brand: SIEMENS; Terminal Connection: Screw Clamp; DC Voltage Rating: 72V DC; Max. AIR Rating: 10kA at 230/400V AC; Series: 5SY4; AC Voltage Rating: 230/400V AC; Curve Type: D.
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SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, D (MPN 5SY41158). Key specifications — Brand: SIEMENS; Terminal Connection: Screw Clamp; DC Voltage Rating: 72V DC; Max. AIR Rating: 10kA at 230/400V AC; Series: 5SY4; AC Voltage Rating: 230/400V AC; Curve Type: D.
SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, D (MPN 5SY41048). Key specifications — Brand: SIEMENS; Terminal Connection: Screw Clamp; DC Voltage Rating: 72V DC; Max. AIR Rating: 10kA at 230/400V AC; Series: 5SY4; AC Voltage Rating: 230/400V AC; Curve Type: D.
Siemens
SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, D (MPN 5SY41048). Key specifications — Brand: SIEMENS; Terminal Connection: Screw Clamp; DC Voltage Rating: 72V DC; Max. AIR Rating: 10kA at 230/400V AC; Series: 5SY4; AC Voltage Rating: 230/400V AC; Curve Type: D.