Protection parts
A glass fuse melts on overcurrent and is replaced; an MCB opens with a thermal or magnetic mechanism and is reset once the fault is cleared. A varistor, which limits voltage surges, also gives protection, but stays in the Resistors category in the Atlas. A fuse and an MCB do not replace residual-current protection. The Lab uses low voltage only.
2 types2 groupsSymbol IEC
Which one should I choose?
1
If you will protect a small supply line in series
Current, F/T type, voltage, breaking capacity and I²t are chosen together.
2
If you will study resettable overcurrent protection
A C curve combines thermal delay with fast magnetic tripping; the Lab is low voltage.
Compare2 types · 5 features
| Type | Protection type | Example current | Trip behavior | Replacement | Typical use |
|---|---|---|---|---|---|
| Glass fuse (5×20 mm) | Fusible wire | 1 A example | F fast, T time-delay; I²t | Is replaced with the same type and value | Supply, meter protection |
| Circuit breaker / MCB (C0,5, 1 pole) | Thermal + magnetic | C0,5, 0.5 A (Lab) | Magnetic 5–10 × In; thermal is time-based | Is reset once the fault is cleared | Overload / short circuit model |
Current, time-current curve, voltage and breaking capacity are chosen together. The Lab uses low voltage only.