EP1 Series
Single Phase SCR Power Control
Phasetronics EP1 series of single-phase SCR power control features phase angle control to provide smooth proportional output power from 0–100%. Available in load currents from 10 to 1,000 amperes at line voltages from 120 through 575 volts AC — ideally suited for all resistive and inductive loads.
| AC Supply Voltage | 120 – 575 Vac |
| Amp Ratings | 10 to 1,000A |
| Control Signal | 4-20 mA, 0-10 Vdc, 0-5 Vdc |
| Load Types | Resistive and inductive |
| Soft Start | Standard feature |
Phase Angle Control
Smooth proportional output from 0–100% with pre-engineered standard options.
Soft Start
Built-in soft start feature assures slow-rising output to eliminate current surges.
Versatile Loads
Suitable for all resistive and inductive load types up to 1,000A.
Variety of Options
Standard pre-engineered options for system designers and panel builders.
EP1 Series
Technical Specifications
Milliamp Input
4–20 mA, Input Impedance 250 Ω
Analog Input
0–10 VDC / 0–5 VDC, 100 kΩ input impedance
Manual Control
10 kΩ, 2W potentiometer, linear taper (customer provided)
Output Current Rating
10 to 1,000 Amps (model dependent)
Output Stage
Back-to-Back configuration (AC Switch)
AC Supply Voltage
120 / 208 / 240 / 380 / 415 / 480 / 575 VAC (+10% / -15%, 50/60 Hz)
Type of Loads
Resistive / Inductive / Lamp
Soft Start
Factory set for initial half-second of operation at power on. Field adjustable via potentiometer from 0.5 to 20 seconds.
Hard Firing Gate Pulse
A combination of high-potential gate pulse and rapid rise time prevents SCR damage due to di/dt stress.
Input Adjustments — Gain
4–20 mA, 0–5 VDC, 0–10 V (gain potentiometer)
Input Adjustments — Offset
50% of gain maximum
Regulation (Optional)
Average Load Voltage regulation of ±2% over a ±10% line voltage input change.
Optional Fusing
I²t fuse protects against short-circuit overloads (Option F)
Transient Voltage Suppressor
Integral MOV (Metal Oxide Varistor) protects against high-potential transient voltage.
SCR Peak Inverse Voltage (PIV)
1500V for all models
RC Snubber
RC snubber networks prevent false firing due to dv/dt characteristics.
Ambient Temperature
Operating range 0°C to 40°C (32°F to 104°F)