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Siemens Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp - D-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensD-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp

The SIEMENS IEC Supplementary Protector (SKU 30XT95, MPN 5SY43408) is a D-Curve, 3-Pole UL1077 DIN Rail-Mount supplementary protector rated at 40 A Amps. It features a Max. AIR Rating of 10kA at 400V AC, AC Voltage…

SKU 3G-OTH-20872

Brand
Siemens
Item
Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp
Category
D-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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Technical Specifications

Siemens
Manufacturer Part Number
5SY43408
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
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Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS IEC Supplementary Protector (SKU 30XT95, MPN 5SY43408) is a D-Curve, 3-Pole UL1077 DIN Rail-Mount supplementary protector rated at 40 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 5SY43408 supplementary protector used for?

The SIEMENS 5SY43408 is a D-curve, 3-pole supplementary protector rated at 40 A. It protects industrial control circuits and equipment against overloads and short circuits, typically in panel building, HVAC, and machinery applications where UL1077 listing is required.

What are the specifications of the SIEMENS 5SY43408?

The SIEMENS 5SY43408 is a 40 A, 3-pole supplementary protector from the 5SY4 series. It has an AC voltage rating of 400 V AC, a DC voltage rating of 72 V DC, and a maximum AIR rating of 10 kA at 400 V AC. Terminal connection is screw clamp, and it mounts on a DIN rail.

Where to buy the SIEMENS 5SY43408 worldwide?

You can source the SIEMENS 5SY43408 supplementary protector 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.

How to install the SIEMENS 5SY43408 on a DIN rail?

To install the SIEMENS 5SY43408, 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. 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 d-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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