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SIEMENS IEC Supplementary Protector: 2 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp - D-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SIEMENS IECD-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors

SIEMENS IEC Supplementary Protector: 2 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp

The SIEMENS IEC Supplementary Protector (SKU 30XU78, MPN 5SY42028) is a 2 A, D-curve, 2-pole UL1077 DIN rail-mount supplementary protector from the 5SY4 series. It is rated for 400V AC with a breaking capacity of…

SKU 3G-OTH-127374

Brand
SIEMENS IEC
Item
Supplementary Protector: 2 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp
Category
D-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors
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Technical Specifications

SIEMENS IEC
Manufacturer Part Number
5SY42028
Type
10kA at 400V AC, Screw Clamp, 5SY4
AC
400V
DC
72V
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SIEMENS IEC Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS IEC Supplementary Protector (SKU 30XU78, MPN 5SY42028) is a 2 A, D-curve, 2-pole UL1077 DIN rail-mount supplementary protector from the 5SY4 series. It is rated for 400V AC with a breaking capacity of 10kA at 400V AC and 72V DC, and features screw-clamp terminals.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the SIEMENS 5SY42028 supplementary protector used for?

The SIEMENS 5SY42028 is a D-curve, 2-pole supplementary protector rated 2 A at 400V AC and 72V DC. It protects branch circuits and equipment from overloads and short circuits in industrial control panels, HVAC systems, and machinery, typically mounted on DIN rails.

What are the specifications of the SIEMENS 5SY42028?

The SIEMENS 5SY42028 is a 2 A, D-curve, 2-pole supplementary protector from the 5SY4 series. It has a breaking capacity of 10kA at 400V AC and 72V DC, with screw-clamp terminals. It is UL1077 listed for DIN rail mounting and rated for 400V AC.

Where to buy the SIEMENS 5SY42028 worldwide?

3G Electric supplies the SIEMENS 5SY42028 supplementary protector worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this genuine SIEMENS part.

How to install the SIEMENS 5SY42028 supplementary protector?

Install the SIEMENS 5SY42028 on a standard DIN rail by snapping it into place. Connect wires to the screw-clamp terminals per the torque specifications in the datasheet. Ensure the circuit is de-energized before installation. Follow local electrical codes and the manufacturer's instructions.

Used in

Common applications for SIEMENS IEC
Motor control centers — Siemens 5SY4 D-curve supplementary protectors (e.g., 5SY42108) for motor branch circuit protection
HVAC equipment — A-curve protectors (e.g., 5SY42255) for compressor and fan motor overcurrent protection
Industrial conveyor systems — 4-pole D-curve protectors (e.g., 5SY44168) for three-phase motor protection with neutral
Pump control panels — 2-pole supplementary protectors (e.g., 5SY42038) for single-phase pump motor protection
Machine tool control circuits — A-curve protectors (e.g., 5SY44155) for solenoid valve and relay protection
Power distribution sub-panels — 4-pole protectors (e.g., 5SY44155) for three-phase branch circuit protection in light industrial settings

SIEMENS IEC Products

3G Electric supplies SIEMENS IEC d-curve, 2-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: 1 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42018). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 1 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42018). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 13 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42138). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 13 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42138). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42038). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42038). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42208). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 20 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42208). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42048). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 4 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42048). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42158). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 1.6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42158). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.

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SIEMENS IEC Supplementary Protector: 32 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42328). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 32 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42328). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42408). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 40 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42408). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 8 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42088). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
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SIEMENS IEC Supplementary Protector: 8 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42088). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 0.5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42058). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC
SIEMENS IEC Supplementary Protector: 0.5 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42058). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 0.3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42148). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC
SIEMENS IEC Supplementary Protector: 0.3 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42148). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42068). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC
SIEMENS IEC Supplementary Protector: 6 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42068). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 16 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42168). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC
SIEMENS IEC Supplementary Protector: 16 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42168). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC Supplementary Protector: 25 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42258). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.
SIEMENS IEC
SIEMENS IEC Supplementary Protector: 25 A Amps, 72V DC, 10kA at 400V AC, Screw Clamp, 5SY4, 400V AC (MPN 5SY42258). Key specifications — attr195785: Screw Clamp; attr195787: 400V AC; attr195786: D; attr195783: 72V DC; attr195784: 10kA at 400V AC; attr215906: 5SY4; attr211128: SIEMENS.