SEBO 2-Pole Rocker Switch for DART

DART owners chasing an intermittent start usually end up at this component. Part 5138 is the two-pole rocker switch for that machine, carrying the operating current across both poles each time it is pressed.

Rocker switches wear from the inside out, which is what makes them frustrating to diagnose. Nothing looks wrong from the outside. The action simply goes soft, the detent stops feeling definite, and eventually the machine only runs when the rocker is held at a particular point or pressed a second time. Because both poles are switched, a failure takes the whole machine down rather than one circuit, so the fault presents as a DART that will not start at all on some days and behaves perfectly on others. That intermittency is exactly why the switch tends to be the last thing suspected and the thing that turns out to be at fault.

Changing it is straightforward work once the cord is out of the wall, and it is a far better outcome than living with a switch that has already started to arc internally. A rocker that feels hot, smells faintly of scorched plastic, or shows browning around the terminals has passed the point of being a nuisance and become something to deal with promptly. The two-pole construction is the specification to match here; a visually similar single-pole switch is not the same part and will not break both sides of the supply.

• Fits: SEBO DART
• Type: two-pole rocker switch
• Function: on/off control, carrying operating current across both poles
• Replace when: the rocker feels soft, sticks, or passes power intermittently
• Part number: 5138

Label the wires as they come off so the new switch goes back exactly the same way, and check the cord entry and strain relief while the housing is open, since a switch that has been flexed hard usually sits alongside a cord that has been pulled. Genuine SEBO DART rocker switch, 2 pole power switch replacement, part 5138.