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Siemens Supplementary Protector: 16 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: 16 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp

The SIEMENS IEC Supplementary Protector (SKU 30XW10, MPN 5SY44166) is a B-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protector from the 5SY4 series. It is rated for 16 A Amps with a Max. AIR Rating of 10kA at…

SKU 3G-OTH-21677

Brand
Siemens
Item
Supplementary Protector: 16 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
5SY44166
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 30XW10, MPN 5SY44166) is a B-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protector from the 5SY4 series. It is rated for 16 A Amps with a Max. AIR Rating of 10kA at 400V AC and a DC Voltage Rating of 72V DC. The unit features a Screw Clamp terminal connection.

Frequently Asked Questions

What is the SIEMENS 5SY44166 supplementary protector used for?

The SIEMENS 5SY44166 is a B-curve, 4-pole supplementary protector designed to protect branch circuits and sensitive equipment from overcurrent and short circuits. It is commonly used in industrial control panels, HVAC systems, and automation applications where DIN-rail mounting and UL1077 compliance are required.

What are the specifications of the SIEMENS 5SY44166?

The SIEMENS 5SY44166 is rated for 16 A amps, 400V AC and 72V DC, with a maximum AIR rating of 10kA at 400V AC. It features a B-curve trip characteristic, screw clamp terminals, and is a 4-pole DIN-rail mount supplementary protector from the 5SY4 series.

Where to buy the SIEMENS 5SY44166 worldwide?

3G Electric supplies the SIEMENS 5SY44166 supplementary protector to customers worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this genuine Siemens part.

How to install the SIEMENS 5SY44166 supplementary protector?

Install the SIEMENS 5SY44166 by snapping it onto a standard DIN rail. Ensure the circuit is de-energized before wiring. Connect conductors to the screw clamp terminals per the torque specifications in the datasheet. Verify the B-curve matches your load type for proper overcurrent protection.

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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