Industrial timing relay comparison
Macromatic TD-7 Series Time Delay Relay Comparison
Macromatic TD-7 digital-set time delay relays use pushbutton thumbwheels to select the timing range and delay. With a 50 ms to 999-hour range, the series supports short delays and extended timing cycles in industrial control panels. Compare its setup controls, relay outputs and mounting options with NCC TMM, Dayton 6A855 and SSAC TRDU relays below.
50 ms–999 hoursWide programmable timing range
Thumbwheel settingsNumeric delay and time-range selection
10 A DPDT outputTwo-pole relay switching
Compare TD-7, NCC TMM / Dayton 6A855 & SSAC TRDU
Review each feature across the three relay groups. Macromatic specifications are highlighted in green. Voltage options, functions and socket requirements vary by catalog number; the listed voltage choices are separate versions, not one universal input.
Time-delay adjustment
Macromatic TD-7
Three pushbutton thumbwheels set the delay; one pushbutton thumbwheel selects the time range.
NCC TMM / Dayton 6A855
Three pushbutton thumbwheels set the delay; one 8-position rotary switch selects the time range.
Operating-mode selection
Macromatic TD-7
One pushbutton thumbwheel on multifunction models.
NCC TMM / Dayton 6A855
One 8-position rotary switch.
Multifunction timing modes
Macromatic TD-7
On delay, off delay, interval on, single shot and flasher.
TD-7812* series also includes on/off delay, watchdog, single shot falling edge, and triggered on delay
NCC TMM / Dayton 6A855
On delay, off delay, interval on, single shot and flasher.
SSAC TRDU
10 single modes and 11 dual modes of operation.
Single-function versions
Macromatic TD-7
Available.
NCC TMM / Dayton 6A855
Available for on delay and off delay only.
Timing range
Macromatic TD-7
50 ms–999 hours
NCC TMM / Dayton 6A855
50 ms–999 minutes
SSAC TRDU
Single-mode timing: 0.1 second–1,705 hours.
Dual-mode timing: 0.1 second–3,100 minutes.
Input-voltage options
Macromatic TD-7
12, 24, 48 and 120 VAC/DC; 240 VAC.
NCC TMM / Dayton 6A855
12 VDC; 24 VAC; 24 VDC; 48 VDC; 120 VAC; 240 VAC.
SSAC TRDU
12 VDC; 24 VAC/DC; 120 VAC; 230 VAC.
Relay output
Macromatic TD-7
DPDT
10 A at 240 VAC / 28 VDC,
½ hp at 240 VAC; ⅓ hp at 120 VAC.
TS-7812* series is:
DPDT
10A @ 240V AC/30V DC,
1/2HP @ 120/240V AC (N.O.),
1/3HP @ 120V AC (N.C.),
B300 & R300; AC15 & DC13
NCC TMM / Dayton 6A855
DPDT
10 A at 240 VAC.
SSAC TRDU
DPDT
10 A at 240 VAC / 28 VDC,
⅓ hp at 120 and 240 VAC.
Socket mounting
Macromatic TD-7
8- or 11-pin octal plug-in, depending on model.
NCC TMM / Dayton 6A855
8- or 11-pin octal plug-in, depending on model.
SSAC TRDU
11-pin octal plug-in.
LED indication
Macromatic TD-7
One LED: output relay status / timing.
NCC TMM / Dayton 6A855
One LED: output relay status / timing.
SSAC TRDU
Two LEDs: input voltage and output relay status.
Dimensions (W × D × H)
Macromatic TD-7
1.8 × 2.4 × 3.0 inches
NCC TMM / Dayton 6A855
1.75 × 2.44 × 3.1 inches
SSAC TRDU
1.8 × 2.4 × 3.1 inches
Agency markings
Macromatic TD-7
UL Recognized; CSA; CE marking.
UL Listed with the appropriate socket.
NCC TMM / Dayton 6A855
UL and cUL Recognized.
SSAC TRDU
UL Recognized; CSA; CE marking.
What Sets the Macromatic TD-7 Apart?
The TD-7 uses thumbwheels for both the numeric delay and time range. That keeps the selected settings visible at the relay, making them straightforward to record during setup or maintenance. Its upper timing limit extends to 999 hours, compared with 999 minutes for the NCC TMM / Dayton 6A855 group.
Single-function versions suit a fixed timing task, while multifunction models let you select an operating mode for the control sequence. Where a listed relay-and-socket combination is required, confirm the appropriate Macromatic socket for the chosen TD-7 model.
How to Select a TD-7 Time Delay Relay
- Match the timing function. Confirm the required operating sequence and trigger behavior before comparing delay ranges.
- Check the control supply. Choose the correct voltage version and verify whether the circuit uses AC or DC.
- Confirm the delay and range. Check both the numeric setting and selected time unit.
- Verify the connected load. Review the applicable contact, motor and pilot-duty ratings for the exact relay.
- Match the socket and wiring. Check pin count, terminal assignments and available panel clearance, including the socket.
Replacing an existing timer? Similar timing ranges and DPDT outputs do not establish a direct replacement. Compare the existing relay's wiring diagram, trigger requirements and load ratings with the exact TD-7 catalog number.
Find the Right Macromatic TD-7 Relay
Browse TD-7 time delay relays or email your existing part number, control voltage and required timing function for selection assistance.
