Commercial WSB1LE-80 3P+N RCBO

Here Type B/C refer to overcurrent trip curve types. The two have exactly the same leakage protection function, and the difference only lies in overcurrent trip characteristics:

• Type B RCBO: Instantaneous trip current is 3~5 times rated current, with high overcurrent sensitivity, suitable for pure resistive three-phase loads without starting inrush;
• Type C RCBO: Instantaneous trip current is 5~10 times rated current, can tolerate starting inrush of ordinary inductive loads, suitable for commercial mixed loads and small power circuits, and is the mainstream choice for commercial power distribution.

The core difference lies in pole protection capability and breaking range:

• 1P+N RCBO: Only the live pole has complete overload and short-circuit trip mechanisms, the neutral pole has no protection and only breaks synchronously. It has small size and low cost, and neutral and live lines cannot be reversely connected. Suitable for ordinary single-phase terminal circuits.
• 2P RCBO: Both live and neutral poles have complete protection trip mechanisms, and both poles can be disconnected simultaneously in case of fault. It has more thorough electrical isolation, reverse connection of neutral and live lines does not affect protection function, with higher safety. Suitable for incoming main switches and circuits with high safety requirements.

The mainstream classification dimensions in the industry are as follows:

• By number of poles: 1P+N, 2P, 3P, 3P+N, 4P;
• By leakage trip type: Type AC (only AC leakage), Type A (AC + pulsating DC leakage), Type B (all types of AC and DC leakage);
• By overcurrent trip curve: Type B, Type C, Type D;
• By operating time: Instantaneous type, time-delay type (Type S, for graded protection);
• By rated current: Full series specifications from 6A to 125A.

The mainstream rated current specifications for civil and commercial scenarios are: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A. Among them, 16A, 20A and 32A are the most commonly used specifications for terminal sockets and lighting circuits, and 63A and above are mostly used for incoming main switches.

It can be identified through three dimensions (note the distinction between “Type B trip curve” and “Type B leakage type”):

• Shell marking: “Type B” trip curve mark is printed on the front of the product, or the instantaneous trip range 3~5In is marked;
• Model code: The product model usually contains a character code representing Type B trip;
• Parameter nameplate: The rated parameter column indicates that the instantaneous trip current multiple is 3~5 times the rated current.

There is no absolute superiority between the two, and adapting to the scenario is the core of selection:

• Circuits with pure resistive loads, high current sensitivity requirements and no starting inrush (such as precision instruments, pure lighting circuits): Type B is more suitable with higher protection sensitivity.
• Ordinary household sockets, commercial mixed loads, circuits with small inductive appliances: Type C is more suitable, can tolerate starting inrush, avoid false tripping, has stronger universality, and is also the mainstream choice for civil power distribution.

1P+N RCBO is a residual current breaker with overcurrent with single-pole plus neutral structure. Structurally, only the live pole is equipped with a complete thermal-magnetic trip mechanism to undertake overload and short-circuit protection; the neutral pole has no protection function and only breaks synchronously. It also integrates a zero-sequence leakage detection module inside to realize leakage protection function. Compared with 2P products, it is smaller in size and lower in cost, and is widely used in single-phase terminal distribution circuits.

It can be used for emergency replacement, but is not recommended as a conventional solution:

Only use two of the poles to connect to the circuit and leave the idle pole unconnected. Core parameters such as rated current and breaking capacity must meet circuit requirements;

3-pole breakers are larger in size, so confirm whether the installation space in the distribution cabinet is sufficient;

It is strictly forbidden to connect two poles in parallel to increase rated current, which will cause trip failure due to uneven current distribution.

From the perspective of cost and installation compliance, breakers with corresponding pole number are preferred.

There is no absolute superiority, select according to circuit protection requirements:

• MCB: Only provides overload and short-circuit protection, with low cost and small size. Suitable for pure power circuits, main lighting circuits, etc. without leakage risk.
• RCBO: Integrates triple protection of leakage, overload and short-circuit, with higher safety level. One unit can replace the MCB+RCD combination and save installation space; suitable for socket circuits, humid environments such as kitchen and bathroom, outdoor circuits and other scenarios prone to leakage and in contact with human body.

The number of types varies by different classification dimensions:

• By leakage trip characteristic: 3 types (Type AC, Type A, Type B)
• By overcurrent trip curve: 3 types (Type B, Type C, Type D)
• By pole structure: 5 types (1P+N, 2P, 3P, 3P+N, 4P)
• By operating time characteristic: 2 types (instantaneous, time-delay Type S)