The TSB151 and TSB152 series SHOCK RELAY allows easy connection into new or existing applications. For single or three phase motors, simply wire the current transformer that we supply into one line of the motor and the SHOCK RELAY into the control circuit (stop-start circuit). The SHOCK RELAY is powered by the same voltage as the control circuit to the motor starter, usually 115V or 230V single phase. If a different control voltage is used, a step down transformer may be required. The supplied current transformer is then connected in one line of the motor that is being monitored. Motor voltages above 600 volts require special considerations. Contact U.S. Tsubaki.
Dimension: TSB151, TSB152, +A/M/W Models
TSB152 Current Transformer
For use with TSB152, TSB152A, TSB152M, TSB152W When ordering the TSB152, please select the correct size current transformer from the chart below. The transformer selected should closely match the motor amperage. U.S. Tsubaki will include the transformer you select with the TSB152 Shock Relay.
*TSB151 is shown
Common Type 50/151 Current Transformer
Current Transformer for TSB152
Full-Load Current
Full-Load
Selected Current Selected
(amps)
CT
(amps)
CT
20 25 30 33 37 40 50 60
100AT 83 250AT 100AT 100 100AT 120AT 120 120AT 100AT 125 250AT 150AT 150 150AT 120AT 200 200AT 100AT 250 250AT 120AT 300 300AT 400 400AT
For use with TSB151, TSB151A, TSB151M, TSB151W
When selecting a Shock Relay and compatible Current Transformer, locate the closest rating to the actual motor current in the list. Selection Example 1. For 4 pole, 230V, 7 1 ⁄ 2 HP motor: rated current 21.5 amps, choose TSB152, 100AT current transformer. 2. For 4 pole 230V, 50HP motor: rated current 124 amps, choose TSB152, 250AT current transformer.
This current transformer has connections to accept motor amperages up to 16.0 amps. This current transformer is included with the TSB151 and by selecting the correct terminals, accepts the full range of motors acceptable for this Shock Relay.
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