Hot Sale WSB1L-80 2P Normal Circuit Breaker

The WSB1L-80 is an 80 A, two-pole miniature circuit breaker providing overload and short-circuit protection for single-phase or split-phase circuits. Because it breaks both line and neutral simultaneously, it is commonly used as a double-pole main switch or for dedicated high-current single-phase loads such as showers, cookers, and EV chargers.

A 2P breaker opens both the live (line) and neutral conductors at the same time on a single internal trip mechanism. This is different from two 1P breakers tied together, which can fail to open both poles if one trips independently. Double-pole isolation ensures the downstream circuit is fully de-energized for safe maintenance.

In = 80 A is the maximum continuous current the breaker can carry without tripping. The connected cable must have an ampacity at least equal to 80 A under the actual installation conditions (method of installation, ambient temperature, grouping). As a rule of thumb, a 16–25 mm² copper cable is typically required, but the final size must be calculated per IEC 60364 or local wiring rules.

Each pole carries a bimetal heater for inverse-time overload protection and an electromagnet for instantaneous short-circuit protection. Because both poles are mechanically linked, a fault on either pole trips both, ensuring simultaneous disconnection of line and neutral. The thermal element trips in seconds to minutes on moderate overloads, while the magnetic element trips in milliseconds on bolted faults.

Curve B (3–5 In) suits lighting and resistive loads; Curve C (5–10 In) is the general-purpose choice for sockets, distribution, and small motors; Curve D (10–20 In) is for high-inrush loads such as transformers, compressors, or large motor starts. For a typical 80 A main or cooker circuit, Curve C is the most common selection.

WSB1L-80 MCBs are typically offered with breaking capacities of 6 kA or 10 kA at 230/400 V. Select the rating based on the calculated prospective short-circuit current at the installation point — a domestic main board near the transformer may need 10 kA, while a remote sub-board may be fine with 6 kA. Never install a breaker with a breaking capacity lower than the available fault current.

It clips onto a standard 35 mm DIN rail inside a distribution board. Line (L) and neutral (N) supply cables are connected to the top terminals, and load cables to the bottom. Torque the terminals to the manufacturer's specified value (typically 2.5–3.5 N·m) to avoid overheating at the connection. Ensure adequate clearance above and below for busbars and cabling.

A 2P breaker guarantees simultaneous opening of line and neutral on a single trip, provides true double-pole isolation, and takes less DIN rail space than two 1P devices. It is also required by many wiring regulations for main switches and for circuits where neutral isolation is needed for safety, such as bathroom circuits or EV charger supplies.

Nuisance trips usually come from overloads (too many appliances on one circuit), inrush current exceeding the magnetic threshold (use a higher curve), loose or corroded terminals causing heat, or an aged breaker. Check total load against 80 A, verify terminal tightness, and consider upgrading to a C or D curve if motor/transformer inrush is the cause. If the breaker trips with no load, replace it.

The WSB1L-80 is designed to IEC 60898-1 and carries CE marking, making it suitable for household, commercial, and light-industrial distribution boards worldwide. It is typically used as a 2P main switch, for single-phase 80 A loads such as electric showers, induction hobs, air conditioners, and EV charger feeders up to the rated current.