This part is a kind of semiconductor called PC7150.

Function of this product has 150/100 Amp Automotive Plug-In / PCB Maxi ISO Relay.

Manufacturers : Picker

Image and pinout :

Some of the text within the PDF file :

150/100 Amp Automotive Plug-In / PCB Maxi ISO Relay PC7150 CONTACT RATINGS 14 VDC at 25oC Contact Form 1 Form A or 1 Form C Normally Open Normally Closed Max Switching Current Make 450 A(1) Break 150 A Make 300 A(1) Break 100 A Max Continuous Current 150 A @ 25°C 112.5 A @ 85°C 100 A @ 25°C 75 A @ 85°C Max Switching Voltage 75 VDC Max. Switching Power 1800 W Minimum Load 0.5A @ 12 VDC FEATURES  Popular Maxi ISO Automotive Relay Footprint  1A and 1C Contact Forms Available  Contact Switching Capacity up to 450 Amps  150 Amps Continuous Carrying Current  Up to 1250C Operating Temperature  Internal Diodes or Resistors Available  Plain Case, Metal Mounting Bracket and PC Pins  Sockets Available  Lead Free and RoHS Compliant CONTACT RATINGS 24 [ ... ]

PC7150 PDF Datasheet Download