NTE5556 25amp silicon controlled rectifier (SCR) TO220
The NTE5556 SCR is designed primarily for half−wave AC control applications,such as motor controls, heating controls and power supply crowbar circuits.
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Image for illustrative purpose only

Features:
Glass Passivated Junctions with Center Gate Fire for Greater Parameter Uniformity and Stability.
Small, Rugged, Thermowatt Constructed for Low Thermal Resistance, High Heat Dissipation and Durability.
Blocking Voltage to 800 Volts
300A Surge Current Capability

Manufacturer datasheet - NTE5556 (Adobe Reader required to read datasheet)