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CCT 31.3 RMS - Allstromwandler AC/DC

primary current

measuring range	0…300 A DC / 0…300 A IRMS AC, variant-dependent! (rated current ranges set to standard values acc. to IEC)
frequency range	DC, or AC 20 Hz … 6 kHz, crest factor ≤ 4
current output	4…20 mA DC, true RMS measurement
Max. burden resistance at current output	RB ≤ 500 Ω (UH = 24 V DC)
Output signal limitation in case of overload	< 25 mA
accuracy	± 1,0 %
Max. operating voltage Um	0,72 kV, Ueff
insulation test voltage	6,4 kV, Ueff, 50 Hz, 5 sec., primary conductor against measuring output/housing
auxiliary voltage	24 V DC, ± 15 %, < 70 mA, external protection via miniature fuse 250 mA / 250 V, fast!
step response time (90 % IPN, di/dt = 100 A / μs)	≤ 200 ms (typ. 150 ms)
signal rise rate di/dt	< 100 A / μs
insulation material class	E
operating altitude	≤ 2000 m (DIN EN 61010-1)
Max. temperature of primary conductor	100° C
humidity	0…95% rel. humidity, no condensation!

Product information

Applied technical standards:

DIN EN 50178, 1997
DIN EN 61010-1, 2002
VDE 0160

Electrical connections:

UH + 0 (Ground) IA
Spring-loaded terminal
Connection cross-sections: 0,08…2,5 mm²

Functions of the CCT 31.3 RMS:

The magnetic field surrounding a current-carrying conductor is detected by a measuring core enclosing the conductor. The magnetic flux induced in the measuring core, which is directly proportional to the current in the primary conductor, is detected by means of a semiconductor component. Integrated control electronics in the device convert the signal supplied by the semiconductor into a DC output current signal proportional to the true RMS value of the measured variable. The true RMS values are calculated using the delta-sigma method.
Due to the inductive, contactless detection of the measured variable, a galvanically isolated
output signal is provided.
The electrical contacting of the secondary circuit of the current transformer is carried out via a 4-pole spring-loaded terminal. This terminal is suitable for connecting flexible stranded wires up to 2,5 mm².
A DC auxiliary power supply of 24 V DC is required to supply the control electronics. The
auxiliary voltage inputs must be protected by a fine fuse 250 mA / 250 V / F.

Advantages and benefits of the CCT 31.3 RMS:

Measurement of both direct and alternating currents possible with only one current transformer.
Accurate calculation of the true RMS values of virtually any time course of the current to be measured.
Wide operating frequency range from 0 Hz (DC) or 20 Hz…6 kHz (AC).
High electrical safety due to galvanically isolated detection of the measured variable.
Low power requirement (≤ 2,5 VA)
Simple and safe electrical wiring using spring-loaded terminal technology.
Direct mounting on busbars via fastening screws integrated in the device.
Mounting on 35mm DIN rails possible using optional snap-on mounting.
High climatic and mechanical resistance due to PU encapsulation of all electrical components.

3D models and more files to each product can be found in our download area downloadarea

Properties

measuring range	0…300 A DC / 0…300 A IRMS AC, variant-dependent! (rated current ranges set to standard values acc. to IEC)
frequency range	DC, or AC 20 Hz … 6 kHz, crest factor ≤ 4
current output	4…20 mA DC, true RMS measurement
Max. burden resistance at current output	RB ≤ 500 Ω (UH = 24 V DC)
Output signal limitation in case of overload	< 25 mA
accuracy	± 1,0 %
Max. operating voltage Um	0,72 kV, Ueff
insulation test voltage	6,4 kV, Ueff, 50 Hz, 5 sec., primary conductor against measuring output/housing
auxiliary voltage	24 V DC, ± 15 %, < 70 mA, external protection via miniature fuse 250 mA / 250 V, fast!
step response time (90 % IPN, di/dt = 100 A / μs)	≤ 200 ms (typ. 150 ms)
signal rise rate di/dt	< 100 A / μs
insulation material class	E
operating altitude	≤ 2000 m (DIN EN 61010-1)
Max. temperature of primary conductor	100° C
humidity	0…95% rel. humidity, no condensation!