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 83120123 STPT12-12K320V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120123 STPT12-12K320V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120122 STPT12-12K320V-2P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules

Mersen

Mersen 83120122 STPT12-12K320V-2P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules

Mersen 83120121 STPT12-12K275V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120121 STPT12-12K275V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120120 STPT12-12K275V-2P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules

Mersen

Mersen 83120120 STPT12-12K275V-2P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules

Mersen 83120119 STPT12-12K150V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120119 STPT12-12K150V-2PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 2+0 TNS, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120117 STPT12-12K320V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120117 STPT12-12K320V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120116 STPT12-12K320V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen

Mersen 83120116 STPT12-12K320V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 277/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen 83120115 STPT12-12K275V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120115 STPT12-12K275V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120114 STPT12-12K275V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen

Mersen 83120114 STPT12-12K275V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 230/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen 83120113 STPT12-12K150V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen

Mersen 83120113 STPT12-12K150V-2PGM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules, Remote indication

Mersen 83120112 STPT12-12K150V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen

Mersen 83120112 STPT12-12K150V-2PG Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph+N, 120/-V, 1+1 TT, 2 Poles, Pluggable, 2 Modules

Mersen 83120110 STPT12-50K-N Surge Protection Device Type 1+2, 50kA Iimp (10/350), N, Neutral, 1 Pole, Pluggable, 1 Module

Mersen

Mersen 83120110 STPT12-50K-N Surge Protection Device Type 1+2, 50kA Iimp (10/350), N, Neutral, 1 Pole, Pluggable, 1 Module

Mersen 83120108 STPT12-25K-N Surge Protection Device Type 1+2, 25kA Iimp (10/350), N, Neutral, 1 Pole, Pluggable, 1 Module

Mersen

Mersen 83120108 STPT12-25K-N Surge Protection Device Type 1+2, 25kA Iimp (10/350), N, Neutral, 1 Pole, Pluggable, 1 Module

Mersen 83120107 STPT12-12K440V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 400V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen

Mersen 83120107 STPT12-12K440V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 400V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen 83120106 STPT12-12K440V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 400V, L-N, 1 Pole, Pluggable, 1 Module

Mersen

Mersen 83120106 STPT12-12K440V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 400V, L-N, 1 Pole, Pluggable, 1 Module

Mersen 83120104 STPT12-12K320V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 277V, L-N, 1 Pole, Pluggable, 1 Module

Mersen

Mersen 83120104 STPT12-12K320V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 277V, L-N, 1 Pole, Pluggable, 1 Module

Mersen 83120103 STPT12-12K275V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 230V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen

Mersen 83120103 STPT12-12K275V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 230V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen 83120102 STPT12-12K275V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 230V, L-N, 1 Pole, Pluggable, 1 Module

Mersen

Mersen 83120102 STPT12-12K275V-1P Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 230V, L-N, 1 Pole, Pluggable, 1 Module

Mersen 83120101 STPT12-12K150V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 120V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen

Mersen 83120101 STPT12-12K150V-1PM Surge Protection Device Type 1+2, 12.5kA Iimp (10/350), 1Ph, 120V, L-N, 1 Pole, Pluggable, 1 Module, Remote indication

Mersen 83070110 PVBT12-1000V-BH-225 PV string box 2 MPPTs, 2 strings per MPPT, with 5 pole Type 1+2 SPD 1000V (without remote indication) and MC4 connectors.

Mersen

Mersen 83070110 PVBT12-1000V-BH-225 PV string box 2 MPPTs, 2 strings per MPPT, with 5 pole Type 1+2 SPD 1000V (without remote indication) and MC4 connectors.

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.