Contactors & Controllers

The Perfect Fit for Simple Applications

Uncompromising process performance in a cost effective format

Easy to integrate and commission, yet highly cost effective, the EFit power controller provides no compromise control for resistive and infrared heating elements. Ideal for all heating applications and fully compliant to international quality, immunity, and emissions standards, Efit achieves outstanding stable, precise control in the most demanding industrial environments, even when cabinet space is at a premium.

The perfect fit for simple heating applications

Some Industrial processes such as heat treatment require precise temperatures in order to comply with regulations and it is imperative that the workpiece temperature is kept within specific limits. This can be difficult to achieve in industrial plants where the operation of large machinery can cause fluctuations in the voltage supply. In the case of resistive heaters a variation of 10% in the supply voltage will generate a 20% variation in the power to the load, resulting in undesirable temperature fluctuations. EFit contains built in compensation that continues to apply stable power with better than ±2% linearity at the boundaries of the load, even during fluctuations in the supply. The result is a reliable, repeatable heating process and high quality end products compliant to demanding heat treatment standards.

Technical Specifications

Directive : EMC directive 2004/108/EC
Low Voltage Directive 2006/95/EC
Safety specification:

EN 60947-4-3:2000 ( 2000-01-12)
+ EN 60947-4-3:2000/A1:2006 (2006-12-08)
+ EN 60947-4-3:2000/A2:2011 (2011-09-02)

EMC emissions specification: EN 60947-4-3:2000 ( 2000-01-12)
+ EN 60947-4-3:2000/A1:2006 (2006-12-08)
+ EN 60947-4-3:2000/A2:2011 (2011-09-02)
Class A product
EMC immunity specification: EN 60947-4-3:2000 (2000-01-12)
EN 60947-4-3:2000/A1:2006 (2006-12-08)
EN 60947-4-3:2000/A2:2011 (2011-09-02)
Vibration tests: EN60947-1 annex Q category E
Shock tests: EN60947-1 annex Q category E
cUL: UL60947-4-1A and UL60947-1
CE: EN60947-4-3 and EN 60947-1
A certificate of conformity can be provided
on simple request
CCC exempt: Product not listed in catalogue of products
subject to compulsory certification
China RoHS:
Restriction of Hazardous Substances compliant
Protection: IP20, According to EN60529 – CE
Open type – UL
Condition of use 
Atmosphere: Non-corrosive, non-explosive, non-conductive
Operatoring temperature:
0 to 45°C without derating
Storage temperature:
–25°C to 70°C (maximum)
1000m maximum at 45°C
2000m maximum at 40°C
For higher temperature see de-rating curves
Degree of pollution:
Degree 2
Humidity limits:
5% to 95% RH (non-condensing)

  EFit SCR Power Controller Technical Specification

Current derating curves as a function
of ambient temperature
I N = nominal current at 45°
for an altitude up to 1000m.

EFit SCR Power Controller Technical Specification

Current derating curves as a function
of ambient temperature
I N = nominal current at 40°C
for an altitude up to 2000m.

Nominal current: 16 to 50A
Nominal voltage: 100V to 500V (+10%/–15%). Refer to
order code for more details
Frequency: 47Hz to 63Hz
Thyristor protection: High speed fuse
Type of loads:
AC51: Pure resistive
AC56a: Transformer Primary
AC55b: Short wave infra-red
Power terminals: Safe cage type, cable size 1.5 to 16mm²
tightening torque 2.3Nm (20.4 lb.In)
Safety earth screw terminal: Cable size 1.5 to to 16mm²
tightening torque 2.3Nm (20.4 lb.In)
Supply of electronics: Self powered product: 100V ac to 500V ac
Auxiliary supply: 115V ac or 230V ac
Auxiliary supply must be in phase with the
line. The control circuit shall be protected by
a ATM2 fuse rated 600V ac/dc, 2A, 100kA
Control setpoint: Either analogue (analogue input or
potentiometer) or logic
Analogue input signal:

DC voltage:

0-5V, 0-10V, Input impedance 100k ohms
DC current: 4-20mA 250 ohms
Burden resistor 250 ohms
Potentiometer: A ‘5V user’ voltage is available between
terminals 5 and 7 to be used with an external
potentiometer of 10Kohm. One
potentiometer per unit should be used
Logic: Contact for On/Off logic operation
Control terminals Plug-in connector 0.5 to 2.5mm²
(24 to 12AWG) cables
Tightening torque 0.6 Nm (5.31 lb.In)
Control Performance
Linearity: Better than ±2% of the full range
Stability: Better than ±2% of the full range with
constant resistance
Automatic compensation for supply
fluctuation (variation: between –10% and
+10% of the nominal voltage).
Firing modes:
Burst: Burst variable (16 periods)
Single cycle
Advanced single cycle
Phase angle: With or without current limit
EFit SCR Power Controller example

Mechanical Details

 Model      Height Width Depth Weight Mounting
16A 115mm 52.5mm 92.5mm 0.55kg DIN rail
25A 115mm 70mm 92.5mm 0.7kg DIN rail
40A 115mm 105mm 92.5mm 0.9kg DIN rail
50A 115mm 122.5mm 92.5mm 1.2kg DIN rail

Order Codes

Basic Product
EFIT Basic SCR Power Controller

1 Current
16A 16 amps
25A 25 amps
40A 40 amps
50A 50 amps

2 Voltage
100V 100 volts
115V 115 volts
200V 200 volts
230V 230 volts
240V 240 volts
277V 277 volts
380V 380 volts
400V 400 volts
415V 415 volts
440V 440 volts
480V 480 volts
500V 500 volts


3 Input
0V5 0–5V dc
4mA20 4–20mA
0V10 0–10V

4 Firing Mode
FC Fast cycle
FC1 Single cycle
SCA Advanced single cycle
PA Phase angle

5 Language
ENG English
FRA French
GER German

6 Supply
SELF Self-powered
115V Auxiliary 115V
230V Auxiliary 230V

7 Current Limit
XX Without current limit
CL With current limt (only with Phase angle)

8 Fuse
NOFUSE Without fuse
MSFUSE Fuse with microswitch
FUSE Fuse without microswitch

Temperature Controllers:

Process Application Control

Whether it is Open-Loop or Closed-Loop Control, a good Control System is critical for long heater life.*

Here we demonstrate a Closed-Loop (Feedback) Control Set-up ~
Generally considered the optimal method, a closed-loop heater control system uses a power controller, temperature controller, and thermocouple to provide a constant output temperature, regardless of changes in airflow.

P116 Dimensions

General views of the controllers are shown below together with overall dimensions.

P116 Rear Terminals

Eurotherm piccolo™ controllers offer precision PID control of temperature and other processes with many advanced features not normally found in this class of controllers.

Designed to offer outstanding performance in an affordable package providing a complete solution for a wide variety of applications, this range guarantees extremely easy access to
parameterization and operation in a high quality unit.

Despite their advanced features, the controllers are easy to use and apply and may be customized for ease of operation. Full autotune is provided.

High quality and high reliabilty

The piccolo controller is a high quality and high reliability
unit from a world leading manufacturer with global
support and service facilities. A 3 year warranty is pro-
vided as standard.

Ramp-soak timer and soft start

A ramp soak timer is provided for time based profiling
of temperature sequences. These can be used to
gradually vary the temperature in a control zone before
maintaining it at a defined level, and is typically used to
avoid the dangers of damage due to thermal shock.

Energy usage estimation

The piccolo controller allows estimation of energy
usage to provide basic data for evaluating energy
saving control strategies for continuous improve-
ment and Kaizen techniques.

Overshoot elimination

The Eurotherm unique cutback system ensures pre-
cise control to setpoint and when correctly tuned
inhibits temperature overshoot.

P116 Rear Terminals

  • Plastic Processing Control 

    The precision PID controller is used to ensure
    uniform heating of the material to avoid material
    derogation, undue strain on the extruder
    components and improve process reliability.

    Can be used to consolidate functions and replace
    several interconnected devices to chillers, including
    an external timer.
  • Incubators

  • Food and Beverage

    The simple timer may be used to control
    batch operations, e.g., food ovens, fryers
    and sterilizers.
  • Furnaces, Ovens & Kilns

    Well adapted for firing ceramics and heat
    treating complex parts.
  • Laboratory Equipment

Environmental Performance  
Temperature Limits Operation: 0 to 60°C
Storage: -10 to 70°C
Humidity Limits Operation: 0 to 90% RH non condensing
Storage: 5 to 90% RH non condensing
Panel Sealing: IP65
Shock: BS EN61010
Vibration: 2g peak, 10 to 150Hz
Altitude: < 2000 meters
Atmospheres: Not suitable for use in explosive or corrosive atmosphere
Electromagnetic Compatibility (EMC)
Emissions and Immunity: BS EN61326
Electrical Safety  
(BS EN61010): Installation cat. II; Pollution degree 2
INSTALLATION CATEGORY II The rate impulse voltage for equipment on nominal 230V mains is 2500V
POLLUTION DEGREE 2 Normally, only non-conductive pollution occurs. Occasionally however, a temporary conductivity caused by condensation shall be expected.
Panel Mounting: 1/16 DIN
Weight: 250g
Panel Cut-Out Dimensions: 45mm W x 45mm H
Panel Depth: 90mm
Operator Interface  
Type: LED
Main PV Display: 4 digits, green
Secondary Display: 4 digits, amber
Status Beacons: Units, outputs, alarms, active setpoint
Power Requirements 100 to 230 ±15%
48 to 62 Hz, max 6W
24V ac, -15%, +10%
24V dc, -15% + 20% ±5% ripple voltage
Max 6W
Approvals CE, cUL listed (File ES7766)
Suitable for use in Nadcap and AMS2750E applications under Systems Accuracy Test calibration conditions
Other standards pending
Process Variable Input  
Calibration Accuracy: <±0.25% of reading ±1LSD
Quoted over full ambient operating range and for all input linearisation types
Sample Rate: 4 Hz (250ms)
Resolution (µV): <0.5µV with 1.6sec filter
Resolution (effective bits): >17 bits
Linearisation Accuracy: <0.1% of reading
Drift with Temperature: <50ppm (typical) <100ppm (worst case)
Common Mode Rejection: 48-62 Hz, >-120dB
Series Mode Rejection: 48-62 Hz, >-93dB
Input Impedance: 100MΩ
Cold Junction Compensation: >30:1 rejection of ambient change
Cold Junction Compensation: >30:1 rejection of ambient change
Cold Junction Compensation: >30:1 rejection of ambient change
Cold Junction Accuracy: <±1°C at 25°C ambient
Linear (process) Input Range: -10 to 80mV, 0 to 10V with 100K/806 external divider module
Thermocouple Types: K, J, N, R, S, B, L, T, C
Resistance Thermometer Types: 3-wire Pt100 DIN 43760
Bulb Current: 0.2mA
Lead Compensation: No error for 22 ohms in all leads
Input Filter: Off to 59.9s
Zero Offset: User adjustable over full range
User Calibration: 2-point gain & offset
OP 4 Relay  
Type: Form C (changeover)
Rating: Min 100mA @ 12V dc, max 2A @ 264V ac resistive
Functions: Control outputs, alarms, events
Logic Output Module  
Rating: ON 12V dc @ <44mA; OFF <300mV @ 100µA
Isolation: None from PV or system, 264V ac double insulated from PSU and communications
Functions: Control outputs, alarms, events
Relay Output Channels  
Type: Form A (normally open)
Rating: Min 100mA @ 12V dc, max 2A @ 264V ac resistive
Functions: Control outputs, alarms, events
Analogue Output - OP2 Voltage output can be achieved by external adaptor
Rating: 0-20mA into <500Ω
Accuracy: ±(<1% of Reading + <100µA)
Resolution: 13.5 bits
Isolation: 264V ac double insulated from PSU and communications
Functions: Control outputs, retransmission
Software Features - Control  
Number of Loops: 1
Loop Update: 250ms
Control Types: PID, ON/OFF
Cooling Types: Linear, fan, oil, water
Modes: Auto, manual, standby
Overshoot Inhibition: High, low
Software Features - Alarms  
Number: 3
Type: Absolute high & low, deviation high, low or band
Latching: Auto or manual latching, non-latching
Output Assignment: Relay and digital output
Other Status Outputs - Functions: Including sensor break, timer status, loop break, heater diagnostics
Timer - Modes: Dwell when setpoint reached; Delayed control action, Soft start limits power below PV threshold
Current Monitor - Alarm Types: Over current, SSR short circuit, SSR open circuit
Current Monitor - Indication Type: Flashing Beacon
Special Features: Energy monitoring, recovery point
  • Calculator
  • Standard Flow Rate (SCFM) Calculator

    Calculate the SCFM.

    Power Flowrate Calculator

    Calculate the electrical power, flow rate or temperature requirement.

    Temperature Conversion

    Fill in one value to calculate the other.

    Ohms Law Calculator

    Fill in two values to find the other two.

    Pressure Conversion

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    Three Phase Unit Calculator

    Fill in two values to find the 3rd.

    Single Phase Unit Calculator

    Fill in two values to find the 3rd.

    Parallel Resistance Calculator

    Calculate the total resistance in ohms of resistors that are in parallel by entering the value of each below.

    Series Resistance Calculator

    Calculate the resistance in ohms of resistors connected in series by entering the value of each.

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