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Siemens Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp - B-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensB-Curve, 4-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 30XW26, MPN 5SY44406) is a B-Curve, 4-Pole UL1077 DIN Rail-Mount supplementary protector rated at 40 A Amps. It features a Max. AIR Rating of 10kA at 400V AC, a DC Voltage…

SKU 3G-OTH-21729

Brand
Siemens
Item
Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp
Category
B-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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Technical Specifications

Siemens
Manufacturer Part Number
5SY44406
Series
5SY4
Type
10kA at 400V AC, Screw Clamp, B
AC
400V
DC
72V
Max. AIR Rating
10kA at 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 30XW26, MPN 5SY44406) is a B-Curve, 4-Pole UL1077 DIN Rail-Mount supplementary protector rated at 40 A Amps. It features a Max. AIR Rating of 10kA at 400V AC, a DC Voltage Rating of 72V DC, and a Screw Clamp terminal connection. This device is part of the 5SY4 series and operates at 400V AC.

Frequently Asked Questions

What is the SIEMENS 5SY44406 supplementary protector used for?

The SIEMENS 5SY44406 is a B-Curve, 4-pole supplementary protector rated at 40 A. It protects branch circuits and sensitive equipment against overloads and short circuits in industrial control panels, HVAC systems, and machinery. Its 72V DC rating suits DC control circuits, while the 10kA interrupting capacity at 400V AC handles high-fault AC applications.

What are the specifications of the SIEMENS 5SY44406?

The SIEMENS 5SY44406 is a 4-pole B-Curve supplementary protector rated at 40 A. It has a DC voltage rating of 72V DC, a maximum AIR rating of 10kA at 400V AC, and screw clamp terminals. It is part of the 5SY4 series, operates at 400V AC, and is UL1077 listed for DIN rail mounting.

Where to buy the SIEMENS 5SY44406 worldwide?

You can source the SIEMENS 5SY44406 (MPN 5SY44406) 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 times; we supply genuine Siemens components for industrial applications.

How to install the SIEMENS 5SY44406 supplementary protector?

Install the SIEMENS 5SY44406 on a standard DIN rail by snapping it into place. Connect wires using the screw clamp terminals, tightening to the torque specified in the datasheet. Ensure the circuit is de-energized before installation. For B-Curve devices, verify the load's inrush current does not exceed the magnetic trip threshold.

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 b-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.

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