Miniature Circuit Breakers (MCB)
MCB Circuit Breakers protect an approved low-voltage circuit using a breaker selected for the installation.
Product-type reference. The supplied make and configuration are confirmed in your quotation.
Buy MCBs for industrial and project requirements
Tirupati Power Enterprises supplies miniature circuit breakers for industrial panels, maintenance spares and electrical projects from Kolkata. To request an MCB price, send the complete make and reference or a schedule of current, poles, voltage, trip curve and required fault duty. List different ratings separately so the offer can be checked against the panel schedule.
This is the dedicated MCB buying page. MCCBs and residual-current devices have separate selection requirements: an ordinary MCB does not provide the residual-current protection associated with an RCCB or RCBO. For procurement in West Bengal, Odisha, Assam and elsewhere in India, include the plant delivery address, PIN code and required date with the technical schedule.
Information to include in your RFQ
Selection requirements for this product type |
|---|
Poles, rated current and voltage |
Trip characteristic and breaking capacity |
Applicable standard and coordination |
Terminal/busbar compatibility and accessories |
Replacement and quotation checks
For a replacement, send the existing miniature circuit breakers (MCB) reference and photographs of its markings, connections and mounting. Include the equipment drawing or datasheet where available. Identify which functions must remain unchanged and whether an alternative make is acceptable.
Related products and buying guidance
Browse switchgear requirements
Moulded Case Circuit Breakers (MCCB)
Motor Protection Circuit Breakers (MPCB)
Request a line-by-line quotation
Sources and further reading
Schneider Electric low-voltage products
MCB ratings and compatibility schedule
Identify the actual circuit requirement rather than choosing a breaker by its handle marking alone. Ratings and breaking performance must be read with the applicable voltage, standard and manufacturer reference.
Buying detail | Include in your RFQ | Confirmation to request |
|---|---|---|
Poles and neutral | SP, SP+N, DP, TP, TP+N or four-pole arrangement as specified | Confirm which poles are protected/switched and the intended circuit |
Current and trip curve | Rated current, B/C/D or specified characteristic, load type | Check the curve against the approved circuit design and starting demand |
Voltage and supply | AC/DC duty, rated voltage and frequency where applicable | An AC rating does not automatically qualify a device for DC use |
Fault interruption | Required breaking duty, prospective fault level and applicable standard | Compare ratings on the same voltage and standard basis |
Panel fit | Rail mounting, module width, terminal/cable and busbar interface | Check mechanical fit and manufacturer accessory compatibility |
Accessories | Auxiliary contact, release, locking and indication requirements | Identify separately ordered accessories and their references |
Compare quotations for the same supply scope
MCB prices vary with series, pole arrangement, current, curve, voltage duty and breaking rating. Compare the full approved reference, rather than only “32 amp MCB” or a nominal discount. Include accessories, pack quantities, GST and freight on the same basis. If you request an alternative series, have its electrical characteristics, terminals and busbar compatibility reviewed before approval. A cheaper current-matched device is not automatically an equivalent.
Prepare your requirement for a quotation
For repeat spares, send a clear label photograph showing the code, current, curve, voltage and breaking markings. Include a view of the rail and busbar connection if the enclosure must remain unchanged.
For a new panel, attach the circuit schedule and the designer’s protection requirements. Mark exact-brand requirements and any permitted equivalent separately; the quotation should record the specific reference offered for each line.
- Make/reference or poles, current, trip curve and AC/DC voltage duty.
- Required fault rating and standard from the approved design.
- Panel/busbar interface and accessory references.
- Quantity per line, required documents, destination and deadline.
Checks before you approve the order
Read the complete rating
Schneider’s MCB selection guidance identifies poles, current, voltage, curve and breaking capacity as distinct selection inputs. Keep them together in the procurement schedule.
Keep leakage protection separate
An ordinary MCB is an overcurrent device. If residual-current protection is required, specify the corresponding device and complete circuit arrangement.
Approve replacements before purchase
Retain the full series/reference on the order; a matching current label does not establish identical trip, mounting or accessory performance.
Buying guidance and technical reference
Related buying ranges and detailed guidance
Moulded Case Circuit Breakers (MCCB)
HRC Fuses, Fuse Links & Fuse Holders (DIN/Bolt type)
MCCB Selection Guide: Current, Fault Duty and Trip Settings
RCCB vs RCBO: Protection and Buying Checks
Manufacturer technical reference
Schneider Electric: MCB selection inputs and breaking capacity
Questions about Miniature Circuit Breakers (MCB)
What should I check before selecting miniature circuit breakers (MCB)?
Current rating alone does not establish fault-interruption suitability. An MCB is not residual-current protection unless the selected device explicitly combines those functions.
What information is needed to quote miniature circuit breakers (MCB)?
Provide poles, rated current and voltage; trip characteristic and breaking capacity; applicable standard and coordination; terminal/busbar compatibility and accessories. Include the quantity, requested make or existing reference and delivery PIN code.
What details are needed for an MCB price?
Provide make and full code, or current, poles, curve, voltage duty and required breaking rating. Add quantity, accessories and delivery PIN code for a comparable quotation.
Are B, C and D curve MCBs interchangeable?
Their trip characteristics differ. Use the curve specified for the circuit and load, with the designer’s fault and protection checks; do not choose by current alone.
Can an AC MCB be used in a DC circuit?
Only when the exact device and connection arrangement are rated for the intended DC application. Check the manufacturer data and circuit design.
Does an MCB also provide earth-leakage protection?
An ordinary MCB does not. Residual-current protection requires an appropriate RCCB, RCBO or specified protection arrangement.
Can I send a mixed MCB schedule for a project?
Yes. List each rating, poles, curve, make/reference and quantity separately, with accessories, documents and delivery details.
Relevant products and guidance
RCCB vs RCBO concerns protection functions: an RCCB provides residual-current protection without integral overcurrent protection; an RCBO combines residual-current and overcurrent functions.
Read articleBuying GuidesMCCB Selection: Current, Fault Duty and Trip SettingsMCCB selection starts with the circuit current, voltage, prospective fault level and protection duties.
Read articleNeed this for your application?
Send the specification, quantity and delivery PIN code. Our Kolkata team quotes supply across India, including eastern India, with availability and freight confirmed for your order.