This part is a kind of semiconductor called AZ973.

Function of this product has 40 AMP AUTOMOTIVE RELAY.

Manufacturers : ZETTLER

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Some of the text within the PDF file :

AZ973 40 AMP AUTOMOTIVE RELAY FEATURES • • • • • • • 40 Amp contact rating High momentary carry current (60A) High operating temperature (85°C) SPST (1 Form A), SPDT (1 Form C) Quick connect terminals Metal or plastic mounting bracket available Resistor or diode parallel to coil available CONTACTS Arrangement Ratings SPST (1 Form A) SPDT (1 Form C) Resistive load: Max. switched power: 560 W (SPST) 560 W (N.O.) 420 W (N.C.) Max. switched current: 40 A (SPST) 40 A (N.O.) 30 A (N.C.) Max. switched voltage: 75 VDC Material Resistance Silver tin oxide < 100 milliohms initially (6 V, 1 A voltage drop method) GENERAL DATA Life Expectancy Mechanical Electrical Operate Time (max.) Release Time (max.) Minimum operations 1 x 107 1 x 105 at 40 A 14 VDC Res. 7 ms at nominal coil voltag [ ... ]

AZ973 PDF Datasheet Download