CAS, CASR, CKSR

Compact Fluxgate based current transducers single supplied (+5V)

CAS, CASR, CKSR - Fluxgate sensors

The CAS, CASR, and CKSR series encompass current sensors tailored for the electronic measurement of DC, AC, and pulsed current, ranging from 1.5 A RMS to 75 A RMS, with galvanic isolation between the primary and secondary circuits.

These product families feature compact Fluxgate-based current transducers, single-supplied (+5V), and boast low offset and gain drift, with a measuring range extending up to 3 times Ipn. Additionally, CAS, CASR, and CKSR sensors are designed for PCB mounting.

CAS and CASR sensors feature 3 primary pins, catering to small current measurements from 2 to 50 ARMS nominal (6A, 15A, 25A, and 50A models).

CKSR sensors, in particular, boast 4 primary pins, with the CKSR 75-NP version even featuring 5 primary conductors, along with higher creepage and clearance distances. It supports small current measurements from 1.5 to 75 ARMS nominal (6A, 15A, 25A, 50A, and 75A models).

Finally, it's worth noting that while CASR and CKSR sensors feature reference access, CAS parts are not.

Operating on closed-loop Fluxgate technology, CAS, CASR, and CKSR parts are predominantly engineered for industrial applications.

CAS, CASR, CKSR – Features and benefits

Main characteristics

Closed loop Fluxgate (compensated) multi-range current transducer
Voltage output
Single supply
Insulating plastic case material recognized according to UL 94-V0
Compact design for PCB mounting

Benefits

Very low temperature coefficient of offset
Very good dv/dt immunity
LTS and LTSR compatible footprint
Reduced height
Bandwidth DC to 300 KHz (+/- 3dB), 200KHz (+/- 1dB)
Fast response time <0.3µs

On top of these benefits, the CASR and CKSR series also offer the following advantages:

Reference pin with two modes: Ref IN and Ref OUT
Extended measuring range for unipolar measurement

CKSR also has its own distinct advantage compared to CAS and CASR, as it comes with a higher creepage distance and clearance.

Typical applications

In industrial settings, CAS, CASR and CKSR electronic components find utility in a variety of applications. Some notable examples include:

AC variable speed and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications
Solar inverters

LEM CAS, CASR, CKSR – Download & Technical Characteristic

CAS Series

Product	Document	Primary nominal RMS voltage	Supply Voltage range	Op. Temperature
CAS 6-NP	Datasheet 3D	6 A	5 to 5	-40 to 85°C
CAS 15-NP	Datasheet 3D	15 A	5 to 5	-40 to 85 °C
CAS 25-NP	Datasheet 3D	25 A	5 to 5	-40 to 85°C
CAS 50-NP	Datasheet 3D	50 A	5 to 5	-40 to 85°C

CASR Series

Product	Document	Primary nominal RMS voltage	Supply Voltage range	Op. Temperature
CASR 6-NP	Datasheet 3D	6 A	5 to 5	-40 to 105 °C
CASR 6-NP/SP6	Datasheet 3D	6 A	5 to 5	-40 to 105 °C
CASR 15-NP	Datasheet 3D	15 A	5 to 5	-40 to 105 °C
CASR 25-NP	Datasheet 3D	25 A	5 to 5	-40 to 105 °C
CASR 25-NP/SP6	Datasheet	25 A	5 to 5	-40 to 105 °C
CASR 50-NP	Datasheet 3D	50 A	5 to 5	-40 to 105 °C

CKSR Series

Product	Document	Primary nominal RMS voltage	Supply Voltage range	Op. Temperature
CKSR 6-NP	Datasheet 3D	6 A	5 to 5	-40 to 105 °C
CKSR 15-NP	Datasheet 3D	15 A	5 to 5	-40 to 105 °C
CKSR 25-NP	Datasheet 3D	25 A	5 to 5	-40 to 105 °C
CKSR 50-NP	Datasheet 3D	50 A	5 to 5	-40 to 105 °C
CKSR 50-NP/SP1	Datasheet	50 A	5 to 5	-40 to 105 °C
CKSR 75-NP	Datasheet 3D	75 A	5 to 5	-40 to 105 °C

CAS, CASR, CKSR Sensors – ASK FOR SAMPLES / QUOTATIONS

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