In some consumer units you will find an MCB (Miniature Circuit Breaker), sometimes called a 'trip switch', instead of fuse carriers. There are two differences between MCBs and fuse carriers: current ratings for MCBs tend to be slightly different from fuse ratings, and the MCBs automatically switch to the 'off' position so a faulty circuit is clearly visible when you inspect the consumer unit.
If your MCB 'trips' to off, turn off the consumer unit's main supply switch and close the switch on the MCB to reset it - there is no fuse to replace. If the MCB switch or button won't stay in the 'on' position when you turn the main power supply back on, then there is still a fault on the circuit, which must be rectified.
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