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Time relays Star – Delta start – up – timers MTR17-TTZ-U240-216

The timers in the MTR17 series in the installation design style, feature the newly developed case front which makes optimum use of the space available within the overall front width of 17.5mm. With the universal supply of 12V AC/DC to 240V AC/DC and different functions it is possible to find solutions even to the most challenging problems. The brain chip of your application-specific miniature controller is the ideal solution for realizing custom control applications within minimum space at low-cost.


Star-Delta start-up (TZ)
When the supply voltage U is applied, the output relay for the star contactor switches into on-position (yellow LED illuminated) and the set star interval T1 begins (green LED flashes slowly). After the star interval T1 has expired (green LED flashes rapidly), the output relay for the star contactor switches into off position (yellow LED not illuminated) and the set transit interval T2 begins. After the transit interval has expired, the output relay for the delta contactor switches into on-position (green LED illuminated). To restart the function, the supply voltage must be interrupted and reapplied.


View of the front panel




Supply voltage Un AC/DC (AC: 50-60Hz) 12 V AC/DC … 240 V AC/DC
Contact arrangement 2 form C  2x16A
Switching current range AC1 – 16 A /250 V AC
Switching load range AC1 4 000 VA
Rated voltage 250/400 VAC
Insulation rated voltage 250 V AC
 Overvoltage category III
Dielectric strength in-out 4 000 V AC
Dielectric strength open contact 1 000 V AC
Time rangers 0,1 s…..100 h
Min. control pulse length AC≥90ms; DC≥45ms
Ambient temperature -20°C …. +55°C

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