Well this one has similar part number - but 55 & 50A rather than 5A
- Although still quite cheap:
https://www.switchelectronics.co.uk/...-channel-to220
If it really is just used as a switch, then it should be too critical on equivalents - just same voltage / current /power ratings and Vgs threshold / ratings.
But switching the negative side seems a bit odd, as rest of the circuitry is then floating at high +V DC (although, if switching that will always be some parts at quite high -ve DC voltage). And I would expect the voltage rating of it may want to be a bit higher than 60V, as could be exposed to much greater ones when it's off, due to leakage currents. So maybe a 600V 5A one, if available, would be more expected.