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Siemens Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp - A-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SiemensA-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors

Siemens Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp

The SIEMENS IEC Supplementary Protector (SKU 30XV52, MPN 5SY43205) is a 20 A, A-Curve, 3-pole UL1077 DIN rail-mount supplementary protector from the 5SY4 series. It is rated for 400V AC and 72V DC, with a maximum AIR…

SKU 3G-OTH-20019

Brand
Siemens
Item
Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp
Category
A-Curve, 3-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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Technical Specifications

Siemens
Manufacturer Part Number
5SY43205
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 30XV52, MPN 5SY43205) is a 20 A, A-Curve, 3-pole UL1077 DIN rail-mount supplementary protector from the 5SY4 series. It is rated for 400V AC and 72V DC, with a maximum AIR rating of 10kA at 400V AC, and features screw clamp terminals.

Frequently Asked Questions

What is the SIEMENS 5SY43205 supplementary protector used for?

The SIEMENS 5SY43205 is a 20 A, A-Curve, 3-pole UL1077 supplementary protector designed to protect downstream equipment from overcurrents and short circuits in industrial control panels, HVAC systems, and machinery. It mounts on a DIN rail and uses screw clamp terminals for secure wiring.

What are the specifications of the SIEMENS 5SY43205?

The SIEMENS 5SY43205 is rated 20 A, 400V AC and 72V DC, with a maximum AIR rating of 10kA at 400V AC. It is a 3-pole, A-Curve supplementary protector from the 5SY4 series, featuring screw clamp terminals and UL1077 listing for DIN-rail mounting.

Where to buy the SIEMENS 5SY43205 worldwide?

3G Electric supplies the SIEMENS 5SY43205 supplementary protector to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this 20 A, 3-pole UL1077 protector from the 5SY4 series.

How to install the SIEMENS 5SY43205 supplementary protector?

Snap the SIEMENS 5SY43205 onto a 35 mm DIN rail, ensuring the retaining clip engages. Connect phase conductors to the screw clamp terminals (torque to manufacturer specification). Verify the circuit is de-energized before installation. This A-Curve protector is for supplementary overcurrent protection only.

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, 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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