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4 Pole Breaker — Sigma Elektrik 4P MCB / MCCB | Jawad Electric
A 4 pole breaker switches all four conductors of a three-phase supply — L1, L2, L3, and Neutral — together in one trip. When a fault occurs on any phase, all four poles open simultaneously, giving complete isolation instead of leaving a live neutral behind. Jawad Electric supplies the genuine Sigma Electric 4 Pole MCB and 4 Pole MCCB range
Sigma Elektrik 4 Pole MCB — Technical Specifications
| Specification | Value |
| Pole configuration available | 1P, 1P+N, 2P, 3P, 3P+N, 4P |
| Nominal current range | Up to 125A |
| Rated breaking capacity | 3kA, 6kA, 10kA, or 16kA (model-dependent) |
| Trip curve options | B curve (3–5× In), C curve (5–10× In), D curve (10–20× In) |
| Standards | IEC/EN 60898-1, CE certified |
| Mounting | 35mm DIN rail |
| Country of manufacture | Turkey |
| Warranty | Full manufacturer warranty via Jawad Electric (authorized distributor) |
For higher current ratings, Sigma Elektrik’s 4 Pole MCCB / thermal-magnetic compact circuit breaker range extends the same 1P/2P/3P/4P pole options from 16A up to 1600A, manufactured to TS 1058 / EN 60947-2 and CE standards, with breaking capacities from 20kA up to 150kA depending on frame size and model. Service breaking capacity (Ics) is rated at 100% of ultimate breaking capacity (Icu) across the range.
For exact ampere rating, breaking capacity, and current pricing on the model in stock, contact our technical team — we’ll confirm the right Sigma unit against your load and fault-level calculation.
MCB vs MCCB — Which 4 Pole Do You Need?
| 4 Pole MCB | 4 Pole MCCB | |
| Current range | Up to 125A | 16A – 1600A |
| Best for | Sub-DBs, solar inverter output, small commercial mains, motor feeders | Main incomers for factories, large commercial buildings, LT panels |
| Breaking capacity | 3kA – 16kA | 20kA – 150kA |
| Trip curve | Fixed B/C/D curve | Often adjustable thermal/magnetic trip |
| Mounting | Standard 35mm DIN rail | Panel-mounted / DIN rail on smaller frames |
Rule of thumb: once your load current or your site’s prospective fault level goes past what a 125A MCB can safely interrupt, move to a 4 Pole MCCB rather than stacking MCBs.
Why the Neutral Pole Matters
A 3 pole breaker switches only the three phases. A 4 pole breaker switches the phases and the neutral together. This matters specifically for:
- Three-phase main incoming breaker. A main breaker should be able to fully de-energise all four conductors before anyone opens the panel. A 3-pole main leaves the neutral live.
- Three-phase solar inverter AC output. Hybrid and on-grid three-phase inverters generate their own live and neutral. A 4 pole breaker keeps the inverter’s neutral properly isolated from the grid neutral when switched off.
- Star-connected loads. Heating elements, unbalanced lighting banks, and some motor configurations draw real current through the neutral, not just the phases — that current must trip with the rest of the circuit.
- Generator changeover / ATS panels. Where WAPDA and generator each carry a separate neutral reference, a 4 pole breaker on each source prevents the two neutrals from ever bridging.
If your load has no neutral — delta-connected motors and pumps, for example — a 3 pole circuit breaker is the correct and more economical choice.
Circuit Breaker Trip Curve Selection Characteristics (B / C / D
| Curve | Trips at | Best for |
| B | 3–5× rated current (In) | Resistive loads, lighting, long cable runs with low fault current |
| C | 5–10× In | General distribution, motors, mixed commercial/residential loads |
| D | 10–20× In | High loads — transformers, large motors, high welding equipment |
For most three-phase main incomers and motor feeders in Pakistan, C curve is the standard choice unless you have specific high-inrush equipment that calls for D.
Where a 4 Pole Breaker Is Used
- Three-phase main incomer for shops, offices, and homes with a three-phase connection
- AC-side protection for three-phase solar and hybrid inverters
- Motor feeders for star-connected and larger three-phase motors
- Generator and WAPDA changeover / ATS panels with separate neutrals
- Commercial kitchen and workshop sub-DBs with unbalanced three-phase loads
- Tube-well and agricultural pump panels requiring full isolation for servicing
Sizing Guidance
Size a 4 pole breaker at roughly 1.25× the full-load current of the motor, inverter, or panel it protects, then confirm against your cable’s current-carrying capacity — cable size, not just load current, ultimately sets the correct breaker rating. For motors with heavy starting inrush (star-delta or direct-on-line starts on larger motors), pair the breaker with a thermal overload relay sized to the actual motor FLC, since a breaker alone won’t catch a stalled rotor or phase imbalance.
Available Ratings & Applications in Pakistan
Looking for the right 4 Pole MCB price in Pakistan? Jawad Electric stocks genuine Sigma Elektrik 4 Pole Circuit Breaker Pakistan and AC Circuit Breaker Pakistan-wide, with common ratings including 20A 4 Pole MCB, 32A 4 Pole MCB, 40A 4 Pole MCB, and 63A 4 Pole MCB — all built as 400V AC MCB units with 6kA breaking capacity, C Curve trip, and standard 35mm DIN Rail mounting to IEC 60898-1 standards. These units work as a three-phase main incoming breaker, a three-phase solar inverter MCB for AC-side output protection, or a 3 Phase Motor Breaker on star-connected feeders — making them a reliable choice for Commercial MCB and Industrial MCB installations, as well as Generator MCB and ATS MCB changeover panels across Pakistan.
Why Buy Your 4 Pole Breaker from Jawad Electric
- Sole authorized distributor in Lahore, Islamabad, Sialkot, Gujranwala, Gujrat, and nationwide.
- Visit us: Shop No. 1, 14th Brandreth Road, Lahore. Call: 0325 8061111 / 0321 8061111. Explore more: Circuit Breakers · MCCB Range · Sigma Electric
- For current price, exact ampere rating in stock, and breaking-capacity datasheet, call or
Frequently Asked Questions
What is a 4 pole breaker (pole breaker)?
The four-pole breaker also switches neutrals simultaneously with all three three-phase supply phases, so that if any conductor develops a fault, the entire circuit trips and the voltage on the neutral does not remain.
What is the difference between 3 pole and 4 pole circuit breakers?
3 pole breaker switches to L1, L2 and L3 only. A 4-pole breaker adds the neutral as a fourth switched pole. Use 4 pole for main incomers, solar inverter AC output, star-connected loads, and multi-source changeover panels where full isolation is required.
What breaking capacities are available for Sigma Electric 4 pole MCBs?
Sigma Electric 4 pole MCBs are available with breaking capacities of 3kA, 6kA, 10kA, or 16kA depending on the model, rated up to 125A, and built to IEC/EN 60898-1.
When should I move from a 4 pole MCB to a 4 pole MCCB?
Once your load current exceeds roughly 125A, or the prospective short-circuit current at your panel exceeds the MCB’s breaking capacity, a 4 pole MCCB — available from Sigma Elektric up to 1600A and 150kA breaking capacity — is the correctly rated choice.
Which trip curve should I choose for a 4 pole breaker?
C curve is the standard choice for most three-phase main incomers, motor feeders, and general commercial distribution. Use B curve for purely resistive/lighting loads, and D curve for equipment with very high starting inrush, such as transformers or large motors.
Can a 4 pole breaker protect a three-phase solar inverter?
Yes — it’s the standard choice for the AC output side of a three-phase solar or hybrid inverter, keeping the inverter fully isolated from the house supply during maintenance. The DC side needs a separate DC-rated breaker, not an AC 4 pole MCB.
Does a 4 pole breaker protect against motor overload on its own?
Not fully. It protects the cable and panel from short circuit and sustained overload, but won’t detect a stalled rotor or phase reversal by itself. Pair it with a thermal overload relay or phase monitoring relay for complete three-phase motor protection.
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