Metal oxide varistor (MOV) , Vm(AC) : 30V / Vm(DC): 38V 16mm package size (radial)
A metal oxide varistor features a barrier layer that gives the user a fast response time. These devices have a high transient current handling capability when high voltage is applied. Static resistance is, however,very high under low voltage conditions, permitting low standby drain currents.
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Image for illustrative purpose only

Features:
High Transient Current Capability : up to 6500A
Fast Response Time−less than 35ns
Excellent Voltage Clamping Characteristics
Very Low Temperature Coefficient
Low Standby Current
High Energy Capability
The Value for “n” is Greater
Very Low Leakage Current
Low Capacitance
Low Overshoot Characteristics

Manufacturer datasheet - NTE2V030 (Adobe Reader required to read datasheet)