You MUST put a low value resistor in series with your tantalum capacitor, say 10 -> 4.7 ohms. Because the tantalum capacitor have such a low impedance, the inrush current into it will overload any switch that switches the supply on to it. To put some figures out, motor, switched off with no snubber network, causes a 200V voltage spike?, tantalum capacitor when 24V is suddenly applied , inrush current ~ 20 A? So a 10 Ohm resistor in series causes inrush to be < 2.4A + motor start current.
Frank