The ABB DTPC721B 3EST126-236 power control unit regulates electrical distribution in industrial systems. This unit weighs 2.35 kg and measures 22.0 cm x 15.0 cm x 8.5 cm. It accepts 400V AC three-phase input and delivers controlled output power. The unit contains three thyristor stacks and one firing circuit board. For energy storage, it includes six 1000µF electrolytic capacitors. Consequently, the ABB DTPC721B 3EST126-236 maintains stable output during brief supply interruptions.
Technical Specifications
The table below lists all verified parameters for the ABB DTPC721B 3EST126-236. Use this data for your system integration planning.
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model | DTPC721B 3EST126-236 |
| Category | Power Control Unit |
| Weight | 2.35 kg |
| Dimensions (L x W x H) | 22.0 cm x 15.0 cm x 8.5 cm |
| Input Voltage | 400V AC ±10% (three-phase) |
| Input Frequency | 50/60 Hz |
| Output Control Type | Phase-angle or burst firing |
| Thyristor Stacks | 3 units |
| Firing Circuit Boards | 1 unit |
| Onboard Components | 3 thyristors, 1 firing circuit, 6 capacitors |
| Energy Storage | 6x 1000µF electrolytic capacitors |
| Total Capacitance | 6000µF |
| Rated Current | 50 A per phase |
| Short-term Overload | 150 A for 10 seconds |
| Control Input Range | 0 to 10V DC or 4 to 20 mA |
| Auxiliary Supply | 24V DC at 200 mA |
| Operating Temperature | 0°C to +50°C |
| Storage Temperature | -25°C to +70°C |
Power Control Features
The ABB DTPC721B 3EST126-236 uses three thyristor stacks for three-phase control. You can select either phase-angle or burst firing modes. Therefore, this unit suits both resistive and inductive loads perfectly. The rated current reaches 50 A per phase continuously. Thus, the unit controls heaters, transformers, and motors up to 34 kW.
Control Interface
This power control unit accepts 0 to 10V DC or 4 to 20 mA control signals. Consequently, you can connect any standard PLC analog output directly. The firing circuit board converts these signals into precise thyristor gate pulses. Hence, the ABB DTPC721B provides smooth and proportional output power. The control response time stays under 20 milliseconds for phase-angle mode.
Energy Storage and Ride-Through
Six 1000µF capacitors provide a total capacitance of 6000µF. This large storage bank delivers 50 milliseconds of ride-through time. Consequently, the ABB DTPC721B 3EST126-236 continues operating through brief input dips. The auxiliary supply requires 24V DC at 200 mA for the firing circuit. Therefore, you need a separate DC supply for the control electronics.
Installation and Cooling
You can mount the ABB DTPC721B 3EST126-236 on a flat metal panel. The unit requires 10 cm of free space above and below for airflow. Use M6 screws through its four mounting feet for secure attachment. For thermal management, the unit uses a forced air fan or natural convection. The ABB DTPC721B works seamlessly with the RMS-TSG-TZ-C static trip unit.
Environmental Durability
This power control unit operates reliably from 0°C to +50°C. It also withstands 90% relative humidity without condensation. The unit survives vibration up to 1g from 10 to 150 Hz. Therefore, the ABB DTPC721B 3EST126-236 suits most industrial control panels perfectly.
Details
| Weight | 0.91 kg |
|---|---|
| Dimensions | 110 × 55 × 90 mm |
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