ISO 4400:1994.

Title:
Fluid power systems and components – Three-pin electrical plug connectors with earth contact – Characteristics and requirements (third edition), 4 pgs.

Scope:
This International Standard specifies the following characteristics and requirements for a general purpose three-pin electrical plug connector with earth contact for use with a single solenoid: the electrical characteristics of the connector
the dimensions of the pins and earth contact
the means for fixing the socket to the plug
the sealing procedure between the plug and the socket
usage requirements. The electrical plug connector specified in this International Standard is intended to be used under working conditions where the connector cannot be damaged by external action (for example, shock or excessive loading).