SmartSwitchTD813 Dual-Input Enhanced Transmitter


The battery-powered Isaacs TD813 Enhanced Power transmitter monitors two sets of dry contacts and transmits the contact state (open or closed) in uniquely coded radio signals to its mated Isaacs receiver(s).

The mated receiver(s) detect the TD812 transmitter signal and uses it to control relay output(s).

In addition to the change-of-state signals, the transmitter sends periodic status signals to allow full supervision of the system.

The SmartSwitch™ TD813 Enhanced dual-Input Transmitter offers a 5-mile range while using Isaacs compact weatherproof enclosure.


Range: 5 miles

Input: Two dry-contacts

Radio: 902 – 928 Mhz, frequency hopping, spread spectrum

Signal: Omni-directional

Power: 3-volt lithium battery    (line powered available: TD817)

Mount: 1″ FNPT fitting

Dimensions: 4.8″ Diameter, 10.6″ Height

Weight: 2.2 lb

Compatible Receivers: RD812 (five output)

Supplementary Devices:

User Guide: