This part is a kind of semiconductor called AZ9731T.

Function of this product has RELAY.

Manufacturers : American Zettler

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Some of the text within the PDF file :

AZ9731T 50 AMP MINI-ISO AUTOMOTIVE RELAY FEATURES • Quick connect terminals • 50 Amp contact rating • High operating temperature (125°C) • Epoxy sealed versions available • Plastic or steel mounting bracket available • Resistor or diode parallel to coil available • Suitable for automobile and lamp accessory applications CONTACTS Arrangement Ratings Material Resistance SPST (1 Form A) SPDT (1 Form C) SPST NO DM ( 1 Form U) SPST (1 Form A2) Resistive load: Max. switched power: 700W Max. switched current: 50 A (N.O.) 40 A (N.C.) Max. switched voltage: 75 VDC 1 Form A : 50A at 14VDC 1 Form C : 50A/40A at 14VDC (N.O./N.C.) 1 Form U : 2 x 25A at 14VDC Silver tin oxide < 100 milliohms initially (6 V, 1 A voltage drop method) COIL Power At Pickup Voltage (typical) Max. Continuous [ ... ]

AZ9731T PDF Datasheet Download