Crouzet # 9700820, GZ series.
Input: 4-15 Vdc.
Output: 480 Vac (20-25A).
Ratings not marked on relay, probably 20-25A based on P2200GZ25 on side of relay. 1.81" x 1.50" x 0.55" high. Turret pins for input and output. Mounting holes on 2.25" centers. UL rated.