During development the original tailplane was replaced by a single fin and rudder, and in this form and fitted with 690 hp Hispano-Suiza 12Xirs engines, the production type was re-designated Potez 540, of which the first was delivered to the Armee de l'Air on November 25, 1934. Parallel with the Potez 540 were developed the Potez 541 prototype, powered by Gnome-Rhone 14Kdrs radials, and the Potez 542 with 720 hp Lorraine Petrel engines.
All versions had defensive armament of manually-operated nose and dorsal turrets and a semi-retractable ventral 'dustbin' position, each fitted with a single 0.295 in (7.5 mm) Dame machinegun. Four 496 lb (225 kg) bombs could be carried on racks mounted beneath the stub wings, or ten 121 lb (55 kg) bombs could be fitted in the internal bomb bay. Radio, oxygen, night and blind flying equipment were standard, and reconnaissance cameras could be carried.
Span: 72 ft 6 in (22.10 m)
Length: 53 ft 1.8 in (16.20 m)
Height: 12 ft 8.75 in (3.88 m)
Wing area: 818 sq.ft (76.0 sq.m)
Empty weight: 8,344 lb (3,785 kg)
Max takeoff weight: 13,118 lb (5,950 kg)
Max speed: 193 mph (310 kmh)
Service ceiling: 17,001 ft (5,182 m)
Range (with max bomb load: 777 mls (1,250 km)."