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Star–Delta Timer MTR17-TTZ-U240-216

  • TZ function
  • Two independently controlled times for Star and for Star-Delta switching
  • Wide range power supply of 12…240V AC/DC
  • 2x 1NO/NC 16A contact arrangement
  • Low power consumption – <2.5 VA or <2 W – high energy efficiency
  • Installation design DIN 35mm
  • 17.5mm width

Time relay MTR17-TTZ-U240-216 equipped with universal power supply can be connected to any AC/DC voltage source in range of 12…240V. Performs TZ function to control Star-Delta contactors requred to reduce inrush currents for 3 phase motors. Microcontroller based circuit ensures high stability of time counter.
Designed to use in industrial automation systems.

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.


Front panel




Version MTR17-TTZ-U240-216
Output Circuit
Contact arrangement 2x 1NO/NC
Rated switching current In AC1 – 16A/250V AC
DC1 – 16A/24V DC
Maximum continuous current 12A
Switching load range AC1 4 000VA
Rated/maximum contact voltage 250/400V AC
Contact resistance ≤ 100mΩ
Maximum switching frequency
600 cycles/h
Input Circuit
Supply voltage Un 12…240V AC/DC
Supply voltage range
0,8…1,1Un (9,6…264V)
Rated consumption AC: ≤ 2,5VA
DC: ≤ 2W
Rated frequency 47…63Hz
Rated surge voltage 1 000V
Insulation rated voltage 250V AC
Rated surge voltage 4 000V (1,2/50μs)
Overvoltage category III
Pollution degree
Flammability PCB: V0, housing: HB
Dielectric strength input-output 4 000V AC
Dielectric strength open contact 1 000V AC
Dielectric strength between contacts 4 000V AC
General Data
Electrical life AC1 at 50% In ≥ 150 000
Mechanical life ≥ 30 000 000
Dimensions (L x W x H) 90 x 17,5 x 66mm
Weight 71g
Ambient temperature -20°C …. +55°C
Relative humidity 85%
IP rating IP20
Shock resistance 15g
Vibration resistance 0,35mm (10…55Hz)
Terminals max 2,5 mm²
Installation DIN rail 35mm
Time Module
Time ranges
10s, 30s, 1m, 3m, 10m, 30m, 1h
Timing adjustment smooth 0,05…1,0 x range
Setting accuracy
Repeatability 0,5%
Recovery time ≤ 100ms

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MTR17-TTZ-U240-216 Datasheet
Time Relay selection table
Declaration of conformity CE


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