AAA Sales & Engineering: Railroad Parts

P-Tech replacement models

Model	Description
7700	Self calibrating loop presence detector with round cord grips for customer loop wire
7700B	Model 7700 with addition of batteries to prevent self calibrating after a short power interruption
7700C	Model 7700 with the addition of capacitors to prevent self calibrating after a short power interruption
7700P	Model 7700 without an enclosure – This unit is mounted on a plate for installation in a customer supplied box
7700P-LR-12V	Model 7700P with an additional latching relay that will cause the unit to show presence afer a power outage until it is reset – Designed for 12VDC power
7700P-LR-24V	Model 7700P with an additional latching relay that will cause the unit to show presence afer a power outage until it is reset – Designed for 24VDC power
7700S	Model 7700 in a smaller metal enclosure
7701	Identical to the 7700, with flat cord grips for AAA wire
7701B	Identical to the 7700B, with flat cord grips for AAA wire
7701C	Identical to the 7700C, with flat cord grips for AAA wire
7701S	Identical to the 7700S, with flat cord grips for AAA wire