The Macromatic TD-78121 is an 11 Pin Time Delay Relay. This digital set programmable plug-in relay has an input voltage of 240V AC. It is a multi-function unit with 10 different settings and a time range of 0.05 sec to 999 hours. The unit features pushbutton thumbwheels that set a more precise time delay and one of seven time ranges. A separate thumbwheel can choose the function and the red LED shows the status of the timing mode. The TD78121 uses an 11 pin 70170-D octal socket with an output of 10A DPDT. Note: Image is an approximation. Actual part may differ.

Timing Functions

On Delay
Interval On
Off Delay
Single Shot
Flasher OFF 1st
Flasher ON 1st
On/Off Delay
Single Shot Falling Edge
Watchdog
Triggered On Delay

Specifications

Relay Function- Multi-Function
Relay Timing Range- 0.05 Sec - 999 Hours
Input Voltage- 240V AC
Output- 10A DPDT
Voltage Tolerance- AC Operation: +10/-15% of nominal at 50/60 Hz
DC Operation: +10/-15% of nominal
Load- 3VA
Setting Accuracy- Constant Voltage/Temp: The greater amount of +/-0.1% of set time or +/-50ms, Variable Voltage/Temp: The greater amount of +/- 1% of set time or +/- 50ms.
Repeat Accuracy- Constant Voltage/Temp: The greater amount of +/-0.1% of set time or +/-0.02 sec, Variable Voltage/Temp: The greater amount of +/- 1% of set time or +/- 0.02 sec.
Reset Time- On Delay/Interval/Flasher: 0.1 Seconds
Functions with Control Switches: 0.04 Seconds
Start Up Time- 0.05 Sec
Maintain Function Time- 0.01 Sec
Insulation Voltage- 2000 V
Operating Temperature- -28 C to 65 C (-18 F to 149 F)
Storage Temperature- -40 C to 85 C (-40 F to 185 F)
Output Contacts- DPDT 10A @ 240V AC/30V DC,
1/2HP @ 120/240V AC (N.O.), 1/3HP @ 120/240V AC (N.C.)
B300 & R300; AC15 & DC13
Life- Mechanical: 10,000,000 Operations, Full Load: 100,000 Operations
Dimensions- 2.4" Height x 1.7" Width x 3" Depth
Approvals- UL Recognized, CE, CSA, UL Listed (with Socket)

Macromatic TD-7 Series Relay Installation Instructions

Explanation of Macromatic Time Delay Relay Timing Functions

Macromatic TD-7 Series Time Delay Relay Competitive Comparison

TD-78121 240V Time Delay Relay