5SM37458RC | Siemens Betagard 5SM3 RCCB 125 A, 4 Pole, 500 mA, Type A – Siemens

Name: 5SM37458RC | Siemens Betagard 5SM3 RCCB 125 A, 4 Pole, 500 mA, Type A - Siemens
Brand: Siemens
SKU: 5SM37458RC
Availability: InStock

SKU: 5SM37458RC

Original price was: ₹50,263.00.Current price is: ₹18,094.68. Excl. GST

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Sourced through authorised channels, the Siemens 5SM37458RC rccb delivers dependable performance for reliable circuit protection and isolation. Key ratings include 125 A, 4 Poles. myelectric.in stocks the 5SM37458RC | Siemens Betagard 5SM3 RCCB 125 A, 4 Pole, 500 mA, Type A for contractors, panel builders, and project buyers — buy online with GST invoice, or request a bulk quote for domestic supply and export to UAE, Singapore, UK, USA, Sri Lanka and more.

📋 Technical Specifications

Parameter	Value
Brand	Siemens
Part Number / SKU	5SM37458RC
Category	RCCB
Current Rating	125 A
Poles	4 Poles
Sensitivity	500 mA
Rated Voltage	415V AC (3-phase 4-wire)
Rated Frequency	50 Hz
Max Break Time	≤ 300 ms at rated IΔn (per IEC 61008-1)
RCD Type	Type A (AC + pulsating DC sensitive)
Protection Function	Earth leakage only — pair with upstream MCB for overcurrent
Mounting	35mm DIN rail (EN 60715)
Test Facility	Built-in test button (monthly test per IS 12640)
Standard	IEC 61008 / IS 12640-1
Certifications	BIS certified, CE, cULus (select models)

⚡ Key Features

500 mA sensitivity — residual current sensitivity for earth-leakage detection.
125 A rated load current — the RCCB carries this full circuit current continuously while monitoring the live-neutral balance for any earth leakage.
4 Poles — for three-phase four-wire (TN-S/TT) installations; all four conductors pass through the toroidal CT for complete leakage detection.
Earth-leakage protection only — no overload or short-circuit protection; install in series with an appropriately rated MCB for full circuit protection.
Mandatory test button — simulate a leakage fault to verify the trip mechanism without live fault conditions; test monthly per IS 12640 recommendation.
Type A — responds to both sinusoidal AC and pulsating DC residual currents; required for circuits with variable speed drives, EV chargers, and switching power supplies.
Manufactured to IEC 61008 / IS 12640-1 — complies with the applicable Indian BIS and IEC international standards for this product category.
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.

❓ Frequently Asked Questions

Q: What is the significance of the 125 A rating on the 5SM37458RC?

A: The 125 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: Why is the 500 mA sensitivity specified on the 5SM37458RC and when should you choose a different rating?

A: 500 mA is the residual current at which the 5SM37458RC will trip within 300ms. A 30mA sensitivity provides additional shock protection (mandatory for socket circuits per IS 732). 100mA is used for fire protection (no shock protection). 300mA protects feeders without nuisance tripping. Choose based on the circuit’s risk profile — never use >30mA for socket outlet circuits in wet or high-risk locations.

Q: How many downstream circuits can be protected under the 5SM37458RC without nuisance tripping?

A: Downstream MCBs or RCBOs can be connected below the 5SM37458RC, but the total standing leakage current of all connected circuits must not exceed 30–50% of the RCCB’s rated sensitivity — typically 9–15mA for a 30mA device. Each appliance with a filter (computers, VFDs, LED drivers) contributes 0.5–3mA of standing leakage, so limit the count of such loads per RCCB to prevent cumulative leakage causing nuisance tripping.

Q: Will the 5SM37458RC trip on earth faults from variable frequency drives (VFDs)?

A: VFDs, LED drivers, and switched-mode power supplies generate high-frequency leakage currents that can cause nuisance tripping in standard Type AC RCCBs. If your installation includes VFDs, use a Type A (for pulsating DC components) or Type F/B RCCB. The 5SM37458RC specification (AC or A type) determines suitability — check the product marking.

Q: What is the difference between an RCCB and a standard MCB — and why use the 5SM37458RC?

A: A standard MCB protects against overload and short-circuit only. An RCCB adds earth leakage (residual current) detection — it trips on faults as low as 30mA to ground, protecting against electric shock and fire from insulation faults, which a standard MCB cannot detect. Choose the 5SM37458RC when the application specifically requires rccb characteristics.