Specifications:

Both of the models:
★ Max input power :70KW,
★ Max input current : 105A,
★ Output Oscillation Frequency : 30-80KHZ
★ Input voltage : Three-phase 380V, 50 or 60 HZ
★ IGBT Power device and the second current-converting techonlogy
★ Duty cycle : 100%
★ water cooling desire: 0.2Mpa,10 L/min 

What are the differences of them?

Model No.	Type	Timer function	Transformer attached	Heating/ Retaining/ Cooling time	Transformer cable length	Dimension (W) X (H) X (L) cm	Weight
SP-70B	Split	NO	YES		2 meters	Main unit: 64×35×55 Transformer: 82×35×46	Main unit: 46kg Transformer: 65kg
SP-70AB	Auto-control/Split	YES	YES	1-99 seconds	2 meters

Features:

1. With 100% continuous duty cycle design,24 hours operation at maximum power output.
2. With constant current and power control function, greatly optimize the heating process of metal,
     to reach efficient,rapid heating, the superiorities can be fully displayed;
3. Multi-functional
    With indications of over-current, over-voltage, water-failure, phase-failure and unmatched load,and
    displays of working current,power and frequency,operation is very easy.
    Multi-level selections for resistance match-up to different load are available.
4. For the auto-control types, power and time of heating and retaining are adjustable, for better
     heating effect and epeatability and simple operation.
5. Portable, lightweight.
6. Simple operation, takes minutes to master.
7. Easy installation, connecting water and power can be done in minutes.
8. Small in size.