Send a part number, a photo, or a whole BOM — we supply it and stand behind it. EXW Singapore — collect from our office.

3G Electric
SIEMENS IEC 5SY44328 D-Curve 4-Pole UL1077 Supplementary Protector - D-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SIEMENS IECD-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors

SIEMENS IEC 5SY44328 D-Curve 4-Pole UL1077 Supplementary Protector

The SIEMENS IEC Supplementary Protector (SKU 5SY44328, MPN 5SY44328) is a D-Curve, 4-Pole UL1077 DIN Rail-Mount supplementary protector rated at 32 A Amps. It features a 72V DC rating and a 10kA interrupting capacity…

SKU 3G-OTH-128202

Brand
SIEMENS IEC
Item
5SY44328 D-Curve 4-Pole UL1077 Supplementary Protector
Part Number
5SY44328
Category
D-Curve, 4-Pole UL1077 DIN Rail-Mount Supplementary Protectors
Available to Order
Also known as:5SY44328SIEMENS IEC
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

SIEMENS IEC
Manufacturer Part Number
5SY44328
Type
10kA at 400V AC, Screw Clamp, D
AC
400V
DC
72V

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

SIEMENS IEC Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS IEC Supplementary Protector (SKU 5SY44328, MPN 5SY44328) is a D-Curve, 4-Pole UL1077 DIN Rail-Mount supplementary protector rated at 32 A Amps. It features a 72V DC rating and a 10kA interrupting capacity at 400V AC, with Screw Clamp terminals. This model is part of the SIEMENS 5SY4 series.

Frequently Asked Questions

What is the SIEMENS IEC Supplementary Protector 5SY44328 used for?

The SIEMENS 5SY44328 is a D-Curve, 4-Pole UL1077 supplementary protector rated at 32 A Amps. It protects industrial control circuits and equipment from overcurrents and short circuits in 400V AC or 72V DC systems, commonly used in panel building and machinery.

What are the specifications of the SIEMENS 5SY44328?

The SIEMENS 5SY44328 is a 4-pole supplementary protector with a D-Curve trip characteristic, rated 32 A Amps at 400V AC and 72V DC. It has a 10kA interrupting capacity at 400V AC and uses Screw Clamp terminals. It is part of the SIEMENS 5SY4 series.

Where to buy the SIEMENS 5SY44328 worldwide?

3G Electric supplies the SIEMENS 5SY44328 supplementary protector to customers 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 D-Curve, 4-Pole UL1077 device.

How to install the SIEMENS 5SY44328 supplementary protector?

Install the SIEMENS 5SY44328 on a DIN rail per UL1077 guidelines. Ensure the supply is de-energized, then snap the device onto the rail. Connect conductors to the Screw Clamp terminals at the specified torque. Verify the D-Curve rating matches your circuit's inrush characteristics before energizing.

Used in

Common applications for SIEMENS IEC
Industrial control panels — Siemens 5SY4 supplementary protectors provide overcurrent protection for PLC I/O, relays, and control transformers.
HVAC equipment — 5SY4 series protectors safeguard control circuits in air handling units, chillers, and boilers against overcurrent.
Pump systems — Siemens IEC supplementary protectors protect motor control circuits and instrumentation in water and process pump stations.
Renewable energy — 5SY4 DC-rated protectors are used in solar combiner boxes and battery storage systems for control circuit protection.
Machine tools — 5SY4 supplementary protectors with D-Curve handle high inrush currents from spindle drives and servo amplifiers.
Building automation — Siemens IEC protectors protect control panels for lighting, security, and access systems in commercial buildings.
Not sure this is the right part? Photo-identify it→

SIEMENS IEC Products

3G Electric supplies SIEMENS IEC d-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.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

More from SIEMENS IEC

View all SIEMENS IEC parts →

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first