5SJ4320-7HG42 | Circuit breaker 10kA, 3-pole, C, 20A according to UL 489-480Y/277V – Siemens

Name: 5SJ4320-7HG42 | Circuit breaker 10kA, 3-pole, C, 20A according to UL 489-480Y/277V - Siemens - myelectric.in
Brand: Siemens
SKU: 5SJ4320-7HG42
Price: 4853.00 INR
Availability: OutOfStock

SKU: 5SJ4320-7HG42

Original price was: ₹10,550.00.Current price is: ₹4,853.00. Excl. GST

Out of stock

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📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	5SJ4320-7HG42
Category	Electrical Component
Current Rating	20 A
Voltage Rating	277V AC
Breaking Capacity	10 kA
Standards	IEC 60947-3 (disconnectors)
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

20 A current rating — confirmed from product specifications; size wiring and terminals to match or exceed this value.
277V AC operating voltage — compatible with standard LV distribution voltages used in Indian industrial installations.
10 kA short-circuit withstand or breaking capacity — protects the installation at high fault current levels.
Manufactured to IEC 60947-3 (disconnectors), IEC 60898, IS 13947, IS 8828 — complies with Indian BIS and IEC international safety standards.
BIS certified, CE, cULus (select models) — meets Indian regulatory requirements for use in government, commercial, and industrial electrical installations.
Genuine authorised Siemens product — sourced directly from the official distribution network with full manufacturer traceability and warranty.
GST invoice provided for India orders — valid for corporate procurement, government project orders, and public tender supply via myelectric.in.
Worldwide export available — UAE, Singapore, UK, USA, Sri Lanka & more. Contact +91 94814 00316 for bulk pricing and international shipping.

❓ Frequently Asked Questions

Q: What is the significance of the 20 A rating on the 5SJ4320-7HG42?

A: The 20 A rating is the device’s maximum continuous current carrying capacity under specified conditions (typically 40°C ambient). For circuit design, use 80% of this value as the design current to allow for derating due to grouping, temperature, and future load growth.

Q: What does the 10 kA breaking capacity on the 5SJ4320-7HG42 mean in practice?

A: Breaking capacity (10 kA) is the maximum prospective short-circuit current the 5SJ4320-7HG42 can safely interrupt without damage. Before installing, verify that the prospective fault level at the installation point does not exceed 10 kA — this is checked using a fault level calculation or from the upstream transformer impedance data. Installing a breaker with insufficient breaking capacity is a serious safety violation.

Q: After a short-circuit trip on the 5SJ4320-7HG42, can it be reset and reused immediately?

A: After a short-circuit trip, do not immediately reset the 5SJ4320-7HG42. First, identify and clear the fault. Then inspect the device — if there is visible arc damage, melted insulation, or the handle does not reset smoothly, the device must be replaced. The 10 kA rated breaking capacity is not unlimited — it is the maximum fault current the device can interrupt safely for a defined number of operations (typically 1–3 at full Icu rating). After any significant fault, factor replacement into your maintenance budget.