This part is a kind of semiconductor called 1N6040.

Function of this product has METAL AXIAL TRANSIENT VOLTAGE SUPPRESSORS.

Manufacturers : Littelfuse

Image and pinout :

Some of the text within the PDF file :

1N6036 - 1N6072A series 1N60 SERIES (1500 WATT) METAL AXIAL TRANSIENT VOLTAGE SUPPRESSORS (hermetically sealed package for harsh industrial environments) FEATURES q Breakdown voltage range 6.8 - 200 volts q Glass passivated junction q Excellent clamping capability q Low zener impedance q 100% surge tested q -55°C to +150°C q Hermetically sealed q Bi-directional MAXIMUM RATING q Peak Pulse Power (Ppk): 15000 Watts (10 x 1000µs)@25°C (see diagram on page 3 for wave form) q 1 watt steady state q Response time: 1 x 10-12 seconds (theoretical) q Operating & storage temperature: -55°C to +150°C MECHANICAL CHARACTERISTICS q Case: Metal hermetically sealed DO-13 package q Terminals: Axial leads, solderable per MIL-STD-202 Method 208 q Solderable leads = 230°C for 10 seconds (1.59mm from ca [ ... ]

1N6040 PDF Datasheet Download