This part is a kind of semiconductor called MAC224A10.
Function of this product has SILICON BIDIRECTIONAL TRIODE THYRISTORS.
Manufacturers : Digitron Semiconductors
Image and pinout :
Some of the text within the PDF file :
DIGITRON SEMICONDUCTORS MAC224(A) SERIES SILICON BIDIRECTIONAL TRIODE THYRISTORS 40 AMPERES RMS Available Non-RoHS (standard) or RoHS compliant (add PBF suffix). Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number. MAXIMUM RATINGS (TJ = 25°C unless otherwise noted) RATING Peak Repetitive Off-State Voltage(1) (TJ = -40 to 125°C, ½ Sine Wave 50 to 60 Hz, Gate Open) MAC224-4, MAC224A4 MAC224-5, MAC224A5 MAC224-6, MAC224A6 MAC224-7, MAC224A7 MAC224-8, MAC224A8 MAC224-9, MAC224A9 MAC224-10, MAC224A10 On-State RMS Current (TC = 75°C)(2) (Full Cycle Sine Wave 50 to 60Hz) Peak Non-repetitive surge Current (One Full Cycle, 60Hz, TJ = 125°C) Circuit Fusing (t = 8.3ms) SYMBOL VDRM IT(RMS) ITSM I2t VALUE 200 300 400 500 [ ... ]