Circuit Breakers & Protection Categories

Miniature Circuit Breakers (MCB)

Molded Case Circuit Breakers (MCCB)

Air Circuit Breakers (ACB)

Residual Current Devices (RCD)

Arc Fault Detection Devices (AFDD)

Surge Protective Devices (SPD)

Circuit Breakers & Protection

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Mersen 83120146 STPT12-12K320V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120146 STPT12-12K320V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen 83120145 STPT12-12K275V-4PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen

Mersen 83120145 STPT12-12K275V-4PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen 83120144 STPT12-12K275V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120144 STPT12-12K275V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen 83120143 STPT12-12K150V-4PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen

Mersen 83120143 STPT12-12K150V-4PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen 83120142 STPT12-12K150V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120142 STPT12-12K150V-4P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 4+0 TNS, 4 Poles, Pluggable, 4 Modules

Mersen 83120141 STPT12-12K320V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen

Mersen 83120141 STPT12-12K320V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen 83120140 STPT12-12K320V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120140 STPT12-12K320V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 277/480V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen 83120139 STPT12-12K275V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen

Mersen 83120139 STPT12-12K275V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen 83120138 STPT12-12K275V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120138 STPT12-12K275V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 230/400V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen 83120137 STPT12-12K150V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen

Mersen 83120137 STPT12-12K150V-4PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 3+1 TT, 4 Poles, Pluggable, 4 Modules, Remote indication

Mersen 83120136 STPT12-12K150V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen

Mersen 83120136 STPT12-12K150V-4PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph+N, 120/208V, 3+1 TT, 4 Poles, Pluggable, 4 Modules

Mersen 83120135 STPT12-12K440V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400; -/690V, 3+0 IT; TNC, 1 Pole, Pluggable, 3 Modules, Remote indication

Mersen

Mersen 83120135 STPT12-12K440V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400; -/690V, 3+0 IT; TNC, 1 Pole, Pluggable, 3 Modules, Remote indication

Mersen 83120134 STPT12-12K440V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400; -/690V, 3+0 IT; TNC, 1 Pole, Pluggable, 3 Modules.

Mersen

Mersen 83120134 STPT12-12K440V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400; -/690V, 3+0 IT; TNC, 1 Pole, Pluggable, 3 Modules.

Mersen 83120133 STPT12-12K320V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/480V, 3+0 TNC, 1 Pole, Pluggable, 3 Modules, Remote indication

Mersen

Mersen 83120133 STPT12-12K320V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/480V, 3+0 TNC, 1 Pole, Pluggable, 3 Modules, Remote indication

Mersen 83120132 STPT12-12K320V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/480V, 3+0 TNC, 3 Pole, Pluggable, 3 Modules

Mersen

Mersen 83120132 STPT12-12K320V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/480V, 3+0 TNC, 3 Pole, Pluggable, 3 Modules

Mersen 83120131 STPT12-12K275V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules, Remote indication

Mersen

Mersen 83120131 STPT12-12K275V-3PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules, Remote indication

Mersen 83120130 STPT12-12K275V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules

Mersen

Mersen 83120130 STPT12-12K275V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/400V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules

Mersen 83120128 STPT12-12K150V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/208V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules

Mersen

Mersen 83120128 STPT12-12K150V-3P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 3Ph, -/208V, 3+0 TNC, 3 Poles, Pluggable, 3 Modules

Mersen 83120127 STPT12-12K75V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 60/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120127 STPT12-12K75V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 60/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120125 STPT12-12K440V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-; 400/-V, 2+0 IT; TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120125 STPT12-12K440V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-; 400/-V, 2+0 IT; TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Circuit breakers and protection devices from ABB, Siemens, Schneider Electric and Mersen cover the full low-voltage protection chain, from miniature circuit breakers to air circuit breakers up to 6300 A. The range includes MCB, MCCB, ACB, residual current devices, arc fault detection devices and surge protective devices in 1 to 4 poles, with more than 4,500 listed products. Stoklink ships worldwide from Turkey and quotes project volumes on request.

What's in this range

Miniature Circuit Breakers (MCB) – DIN-rail overcurrent protection for final circuits and distribution boards.
Molded Case Circuit Breakers (MCCB) – feeder and motor-circuit protection with adjustable trip units.
Air Circuit Breakers (ACB) – main incomer and bus-tie breakers from 630 A to 6300 A.
Residual Current Devices (RCD) – earth-leakage protection against shock and fire.
Arc Fault Detection Devices (AFDD) – detection of series and parallel arcs in final circuits.
Surge Protective Devices (SPD) – protection of installations against transient overvoltage.

How to choose

Rated current and pole count, matched to the load and the neutral arrangement.
Breaking capacity at the installation voltage, at or above the prospective short-circuit current.
Standard: IEC 60898-1 for household and similar MCBs, IEC 60947-2 for industrial breakers, IEC 61008 and 61009 for RCDs.
Trip characteristic or trip unit type, and coordination with upstream and downstream devices.

FAQ

What is the difference between an MCB and an MCCB?

An MCB is a DIN-rail breaker for final circuits, usually with fixed thermal-magnetic tripping. An MCCB covers higher currents and short-circuit levels and often has adjustable or electronic trip units.

Do I need an RCD in addition to a circuit breaker?

Yes, where earth-leakage protection is required. A standard breaker protects against overload and short circuit, while an RCD detects leakage current to earth.

Can you ship circuit breakers outside Turkey?

Stoklink ships worldwide from Turkey on EXW terms. Lead time depends on distributor stock, so request a quote with your part numbers and quantities.