Type TR relays are a range of multi-contact attracted armature relays designed to both IEC 255-5 and to BS142. A wide range of models is available to meet the requirements of the electric supply industry. High speed, positive action Can be supplied in modular and drawout type case Robust design for a long, reliable service life TR1 Low burden to ESI 48-4 EB1 & NGTS 3.6.15, ESI 1. TR2 High burden to ESI 48-4 EB2 & NGTS 3.6.15, ESI 2 TR312 NGC (CEGB) P15. (low burden trip relay) TR431 NGC (CEGB) TDM 5/11. (switching relay) TR512 NGC (CEGB) P11 1978. (unstabilising relay) Low burden, TR1 series Type TR1 relays are suitable for application for tripping and auxiliary duties where immunity to capacitance discharge is not required. These relays are not intended for use with current operated series follower relays. High burden, TR2 series High burden relays with immunity to capacitance discharge currents. They are also suitable for certain applications where they are remote from the initiation signal. A high burden also permits reliable operation of current operated series repeat relays. TR relays can be provided with an instantaneous or time-delayed cut-off. Low burden relay, TR312 Designed to meet the requirements of NGC specification P15, this is an electrically reset relay (no flag indicator) with additional terminals in the economy circuit to enable a direct connection to the dc supply. This arrangement allows a reduction in the break duty of the initiating contact. Switching Relay, TR431 Designed to meet the requirements of NGC TDM 5/11, this is an electrically reset relay with a flag indicator which follows the contact operation. These relays are intended to switch protection and auto reclose equipment in and out of service when controlled over pilot wires from a remote point. They are intended to operate from a remote 50V d.c. battery with a pilot loop resistance of up to 200 ohms. Protection unstabilising relay, TR512 Designed to meet the requirements of NGC specification P11, this is a self reset relay without a flag indicator. Special purpose relays, TR9 series This designation identifies TR relays designed to meet a special purpose e.g. TR901 is a high burden repeat relay, a type TR231 with a 2 position flag indicator used as a plant follower relay for circuit breakers and disconnectors. 7PG15 - TR Relays High Speed Tripping Description Siemens Protection Devices Limited 3 Relay Type Number of Contacts Contact Reset Arrangement Operating Coil Cut-off Specification Burden Level Modular Case Size TR112 7 or 11 Self Economy EB1 low E4 TR121 7 or 11 Hand Instantaneous EB1 Low E2 TR131 6 or 10 Electrical Instantaneous EB1 Low E2 TR141 6 or 10 Hand & electrical Instantaneous EB1 Low E2 TR212 6 or 10 Self Economy EB2 High E2 or E4 TR214 5 or 10 Self Economy 2s delayed reset EB2 High E4 TR221 7 or 11 Hand Instantaneous EB2 High E2 TR223 7 or 11 Hand 40/60ms delay EB2 High E4 TR231 6 or 10 Electrical Instantaneous EB2 High E2 TR233 6 or 10 Electrical 40/60ms delay EB2 High E4 TR241 6 or 10 Hand & electrical Instantaneous EB2 High E2 TR243 6 or 10 Hand & electrical 40/60ms delay EB2 High E4 TR312 5 Self Economy NGC P15 Low E4 TR431 7 Electrical Instantaneous NGC TDM.5/11 Low E4 TR512 6 Self Economy NGC P11 High E4 TR901 10 electrical Instantaneous EB2 High E2 Table 1 Standard Relays Siemens Protection Devices Limited 4 TR1 and TR2 relays Operating time 10ms at rated voltage Rated voltage Vn 24V, 30V, 48V, 125V, 240V d.c. Note: 24V and 240V ratings are not part of ESI 48-4 Operating range 50% to 120% of rated voltage Operating coils of self-reset and economy cut-off relays are rated at 120% of rated voltage. All other operate and reset coils are short time rated well in excess of the operating time of their cut-off contacts. Self-reset relays will reset at not less than 5% rated voltage. Nominal burdens BURDEN (W) Rated voltage V d.c. TR1-- TR2-- 30 43 43 48 46 52 125 47 127 Reset coil 50 50 Relays with economy circuits reduce to approximately 7W after operation. Contacts Ratings Make and carry continuously: 1250VAa.c. or 1250Wd.c. within limits of 660V and 5A Make and carry for 3 seconds: 7500VAa.c. or 7500Wd.c. within limits of 660V and 30A Break: 1250VAa.c. or 100W (resistive) d.c. or 50W (inductive) d.c. within limits of 250V and 5A Indication: TR1 and TR2 relays have a hand reset mechanical flag indicator, TR4 and TR9 relays have a self reset flag indicator.