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Siemens Supplementary Protector: 25 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp - A-Curve, 1-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensA-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 (SKU 30XU39) is a 25 A, A-curve, 1-pole UL1077 DIN rail-mount device. It features a screw clamp terminal connection and is rated for 230/400V AC with a maximum AIR…

SKU 3G-OTH-21436

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

Siemens
Manufacturer Part Number
5SY41255
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
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Siemens 5SY4 series IEC supplementary protector (SKU 30XU39) is a 25 A, A-curve, 1-pole UL1077 DIN rail-mount device. It features a screw clamp terminal connection and is rated for 230/400V AC with a maximum AIR rating of 10kA, as well as 72V DC.

Frequently Asked Questions

What is the Siemens 5SY41255 supplementary protector used for?

The Siemens 5SY41255 is a 25 A, A-curve, 1-pole supplementary protector designed for overcurrent protection in industrial control panels, HVAC equipment, and lighting circuits. It mounts on a DIN rail and meets UL1077 standards for branch-circuit protection in AC and DC applications.

What are the specifications of the Siemens 5SY41255?

The Siemens 5SY41255 is rated 25 A with a 10kA interrupting capacity at 230/400V AC and 72V DC. It features a screw clamp terminal connection, A-curve trip characteristic, and 1-pole DIN rail-mount design. The series is 5SY4 and the MPN is 5SY41255.

Where to buy the Siemens 5SY41255 worldwide?

3G Electric supplies the Siemens 5SY41255 supplementary protector worldwide. As a global industrial distributor, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time; we source and deliver this Siemens 5SY4 series device to any country.

How to install the Siemens 5SY41255 supplementary protector?

Install the Siemens 5SY41255 by snapping it onto a 35 mm DIN rail. Ensure the circuit is de-energized, then connect wires to the screw clamp terminals per the torque rating on the device label. Follow Siemens' instructions for proper orientation and clearance; always verify voltage and current ratings match your application.

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 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.

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SIEMENS IEC Supplementary Protector: 32 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, A (MPN 5SY41325). 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: A.
SIEMENS IEC Supplementary Protector: 8 A Amps, 72V DC, 10kA at 230/400V AC, Screw Clamp, 5SY4, A (MPN 5SY41085). 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: A.
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