Inverse Definite Minimum Time Lag Overcurrent Protection Relay Type By Easun Reyrolle Ltd.

We are involved in manufacturing an supplying of Inverse Definite Minimum Time Lag Overcurrent Protection Relay Type in Hosur, Tamil Nadu, India. TJM Relay is available in three versions viz. 2TJM 10, 11 and 12. These are disc-operated relays, and provide IDMT, single/three pole, overcurrent protection, with/without highset and with/without directional and phase fault protection. The 2TJM relays are completely drawout, and have 2NO contacts for external tripping purposes.

2TJM10:
The relay comprises a die-cast frame, which carries all the sub-assemblies of induction disc, electro-magnetic system, operating coil, plug bridge and the contact assembly. Instantaneous highset and directional elements can be provided.

The electro-magnetic system comprises primary and secondary magnets arranged with four air gaps each contributing to the driving torque. The primary coil energises the primary magnet and a secondary winding which in turn energises the secondary magnet. Tappings on the primary coil permit various fault settings to be made via a plug-bridge. The plug-bridge automatically selects the highest setting when the setting-plug is withdrawn.

Two normally open contacts are provided of the bridging type, the operating arm being driven by a cam track at the hub of the induction disc. This gives considerable mechanical advantage and ensures high contact pressures, even at low operating current levels, making the contacts suitable for direct tripping.