MODEL: MAKF

MAKF SPECIFICATIONS

ES-8143 Rev.3 Page 2/5

http://www.m-system.co.jp/

PERFORMANCE

Response time: ≤ 20 nsec.

Maximum discharge current: 20kA × twice (8/20 μsec.)

Nominal discharge current: 5 kA (8/20 μsec.)

Insulation resistance: ≥ 100 MΩ with 500 V DC (line to

alarm output)

Dielectric strength: 2000 V AC @ 1 minute (line to alarm

output)

Leakage current: ≤ 1 mA at the discharge voltages listed in

the table below.

MODEL

Uc

DISCHARGE

Up

VOLTAGE @1.0kA (8/20 µs) @5kA (8/20 µs)

(AC) (V)

(Vmin)

(Vmax)

(Vmax)

MAKF-120

150

250

600

800

MAKF-240

275

420

1000

1400

MAKF-280

320

460

1100

1500

MAKF-400

440

670

1500

2100

MAKF-480

530

820

1800

2500

Uc = Maximum continuous operational voltage

Up = Voltage protection level

CONNECTION EXAMPLES

■CONFIGURATION EXAMPLE: Single-phase / 2-wire connection

Protected

Device

Circuit

Breaker ‘a’

Cross-wiring

Grounding (100Ω or less)

MAKF

G

*1.

*2.

*3.

*4.

*5.

The circuit breaker must be installed.

Molded-case circuit breakers (MCCB), earth leakage circuit breakers (ELCB) or

current-limiting fuses (slow-blow type only) can be used.

The rated interrupting capacity of the circuit breaker must be greater than the highest

amount of current that could be available in the circuit.

The MCCB or ELCB must has elements at both poles.

Time-delay type over-current protection is recommended for an ELCB.

Recommended sensitivity current rating: 30mA

If the rated current of the circuit breaker ‘a’ exceeds 30A, or if the loss of power supply

to the protected device should be prevented when the circuit breaker ‘a’ blows due to

a surge protector failure, install the circuit breaker ‘b’ (rated current 20-30 A) at the

branch circuit.

Cable length between the branch point and the grounding:

0.5 meters or less recommended.

The protected device’s metal housing must be cross-wired to the ground terminal of

the MAKF. If the protected device has no ground terminal, ground only the MAKF.

In order to protect an electronic circuit such as switching regulartors, we recommend

to use surge protectors which have serial impedance incorporated such as

M-System’s models MAX, MMA, MAH.

Circuit

Breaker ‘b’