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• Smaller than a Normal Power Controller.

• Enables low-noise power control in combination with zero-cross SSRs. (See note.)

• One Controller can control up to 8 SSRs.

• RS-485 communications to set manipulated variables and heater burnout detection. The Smart FB Library for the G3ZA can also be used.

• CE Marking

Load power supply
voltage range
100 to 240 VAC 400 to 480 VAC
Power supply voltage 100 to 240 VAC (50/60 Hz)
Operating voltage range 85 to 264 VAC
Power consumption 16 VA max.
Load power supply voltage 100 to 240 VAC 400 to 480 VAC
Load power supply voltage range 75 to 264 VAC 340 to 528 VAC
Manipulated variable input 0.0% to 100.0% (via RS-485 communications)
Current transformer input *1 Single-phase AC, 0 to 50 A (primary current of CT)
Single-phase AC, 0 to 150 A (primary current of CT)
Trigger output One voltage output for each channel, 12 VDC ±15%, Max. load current: 21 mA
(with built-in short-circuit protection circuit)
Alarm output NPN open collector, one output
Max. applicable voltage: 30 VDC, Max. load current: 50 mA
Residual voltage: 1.5 V max., Leakage current: 0.4 mA max.
Indications LED indicators
Control method Optimum cycle control
Soft-start optimum cycle control *2
Three-phase optimum cycle control
Ambient operating temperature -10 to 55°C (with no icing or condensation)
Ambient operating humidity 25% to 85%
Storage temperature -25 to 65°C (with no icing or condensation)
Elevation 2,000 m max.
Accessories Instruction Sheet



*1. CT inputs are provided only on Models with heater burnout detection.
*2. Use an SSR without the zero-cross function (G3PA-[]BL-VD) for soft-start optimum cycle control. (Refer to G3PA for




Current indication accuracy Current Range
0 to 50 A, ±3 A
0 to 150 A, ±9 A
0 to 100%, ±6% *
(for models with heater burnout detection)
Insulation resistance 100 MΩ min. (at 500 VDC) between primary and secondary
Dielectric strength 2,000 VAC, 50/60 Hz for 1 min between primary and secondary
Vibration resistance Vibration frequency: 10 to 55 Hz, acceleration: 50 m/s2 in X, Y, and Z directions
Shock resistance 300 m/s2 three times each in six directions along three axes
Weight Approx. 200 g (including terminal cover)
Degree of protection IP20
Memory protection EEPROM (non-volatile memory) (number of writes: 100,000)
Installation environment Overvoltage category II, pollution degree 2 (according to EN61010-2-201)
Approved standards UL508 (Listing), CSA22.2 No. 14



* When measured with percentage selected for the current monitor parameter and the maximum current measurable
with the CT at 100%.


Communications Specifications


Transmission line connections Multipoint
Communications method RS-485
Max. transmission distance 500 m
No. of nodes 31 (via multidrop connections)
Synchronization method Stop-start synchronization
Communications baud rate 9.6, 19.2, 38.4 or 57.6 kbps, Default: 9.6 kbps
Transmission code ASCII
Communications data length 7 or 8 bits, Default: 7
Communications stop bits 1 or 2 bits, Default: 2
Communications parity Vertical parity: None, even, or odd, Default: Even
Flow control None


Current Transformer Specifications (Order Separately)


Item Specification
Model number E54-CT1 E54-CT3 G3ZA-CT150L
Max. continuous heater current 50 A 120 A * 150 A
Detection current with G3ZA connected 50 A 150 A
Dielectric strength 1,000 VAC for 1 min 2,000 VAC for 1 min
Vibration resistance 98 m/s2, 50 Hz
Weight Approx. 11.5 g Approx. 50 g Approx. 130 g
Accessories None Connection terminals (2)
Plugs (2)