The CBT8 Circuit Breaker Test Set provides up to 8 contacts per phase, opto-isolated (each contact consisting of 1 main and 2 resistor interrupters in parallel). Contact sense voltage is 24 Vdc at 100 mA. Analog inputs are 4 per phase, 2.5 Vdc differential, opto-isolated. Outputs are trip and close initiation signals. Dry contact rating is 100 Vdc at 20 A.