Ive seen some 100 amp 120/240 volt panels with a main breaker that arent all that expensive at the big box stores, thats one way to handle it.
If you dont want to upgrade your wiring to 100 amps just install a smaller 40 amp breaker (Or do a backfeed if such isnt possible)
Another option is a small sub panel in which you use a proper 40 amp branch breaker to backfeed the rest of the buss.
If youre going to supply 120/240 volt single phase three wire service (i.e. more then just say an outlet) at the pole barn DONT FORGET EACH BUILDINGS ELECTRICAL SERVICE REQUIRES CONNECTION TO A GROUNDING ELECTRODE
The old system allowed you (if no other electrical paths) to run out only 3 wires (2 Hots and a Neutral) while the modern system requires 4 wires out to the pole barn (2 hots, Neutral, Equipment Ground). Under the new 4 wire system out at the pole barn DO NOT I REPEAT DO NOTTTTTT BOND THE EQUIPMENT GROUND BUSS TO THE NEUTRAL BUSS AS DONE AT THE MAIN SERVICE ENTRANCE
NOTE check with your local authority as requirements (if any in your area) vary city to city and county and state to state DO AS THEY REQUIRE NOTTTTTTTTTTTTTT ANY OPINIONS HERE BE THEY LAY OR PROFERSSIONAL
If in doubt I in good faith and conscience have to recommend you consult with a licensed professional qualified electrician if youre not competent to make decisions or do the work safely yourself DONT FORGET THE GROUNDING ELECTRODE
John T Long retired EE and rusty on the NEC so no warranty
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