Tripper RCCB 40A DP 240V AC 300mA | L&T – BC204030

Name: L&T Tripper 40A 300mA DP RCCB | BC204030
Brand: Lauritz Knudsen (L&T)
SKU: BC204030
Price: 3680.00 INR
Availability: InStock

SKU: BC204030

₹3,680.00 Excl. GST

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The BC204030 BC204030 is a rccb, engineered for reliable circuit protection and isolation in demanding Indian and international installations. Key ratings include 40 A, 240V AC, 2 Poles. Buy the Tripper RCCB 40A DP 240V AC 300mA | L&T online at myelectric.in with GST invoice, genuine-product assurance, and fast delivery across India — bulk and worldwide export enquiries welcome.

📋 Technical Specifications

Parameter	Value
Brand	BC204030
Part Number / SKU	BC204030
Category	RCCB
Current Rating	40 A
Voltage Rating	240V AC
Poles	2 Poles
Sensitivity	300 mA
Rated Voltage	230V AC
Rated Frequency	50 Hz
Max Break Time	≤ 300 ms at rated IΔn (per IEC 61008-1)
RCD Type	Type AC (sinusoidal AC 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 where applicable

⚡ Key Features

300 mA sensitivity — coarse sensitivity for fire protection on large circuits — must be backed by a 30mA RCCB at the point of use for personnel protection.
40 A rated load current — the RCCB carries this full circuit current continuously while monitoring the live-neutral balance for any earth leakage.
2 Poles — for single-phase circuits; both live and neutral pass through the sensing core.
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 AC — designed for purely sinusoidal AC residual currents on standard residential and commercial circuits.
Manufactured to IEC 61008 / IS 12640-1 — complies with the applicable Indian BIS and IEC international standards for this product category.
BIS certified where applicable — meets Indian regulatory requirements for use in government, commercial, and industrial electrical installations.
Genuine authorised BC204030 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 40 A rating on the BC204030?

A: The 40 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 300 mA sensitivity specified on the BC204030 and when should you choose a different rating?

A: 300 mA is the residual current at which the BC204030 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: Will the BC204030 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 BC204030 specification (AC or A type) determines suitability — check the product marking.

Q: How many downstream circuits can be protected under the BC204030 without nuisance tripping?

A: Downstream MCBs or RCBOs can be connected below the BC204030, 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: What is the difference between an RCCB and a standard MCB — and why use the BC204030?

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 BC204030 when the application specifically requires rccb characteristics.