The Micro-Z™ Cable
The story behind the cable that outperforms all others.
What Do You Really Need in a Surge Protector?
• Must divert all transients away from
• Perform for at least 20 years
How Do We Achieve 20 Years + Life?
Easy. Use higher rated MOVs on the AC line.
On a 120VAC line, use 180V MOVs rather than the typically employed 140-150V MOVs.
Concern: In most cases, the use of higher voltage MOVs results in a higher clamp
voltage, enabling larger transient exposure to downstream equipment.
At first glance, Micro-Z™ cable looks much like any other cable, however its special construction creates a cable with only 60% of the voltage drop of conventional cables. The significant MCG edge is to use higher voltage MOVs overall for long life and lower cable drop to get lower clamp voltage.
Micro-Z™ Cable is not just any other cable. It’s a high-performance approach in your fight against surges.
Voltage Drops along Power Cabling - Cable Voltage Drop - Micro-Z vs. #6 AWG
Velonex Pulse Generator
delivered a Standard ANSI
C62.41 waveform (6kv/3kA, 8/
20µs) into a 12 foot cable pair,
consisting of two #6 AWG
power cables, tightly taped along
its full length.
Voltage drop measurements
were made at 1 foot intervals
along the cable length.
Axial power cabling configuration from the protector to the service panel forces magnetic field cancellation
within the cable. This results in a correspondingly low "inductive" voltage drop along the cable that is up to 67%
lower than conventional cabling approaches.
Your sensitive equipment will be exposed to a peak transient voltage which is the sum of the surge protector’s
"Clamp Voltage" + the cable voltage drop, which is a function of its length.
A surge protector designed for use on 120 VAC Service, will limit a 6kv/3kA (8/20µs) transient to a clamp voltage
of 464V at its terminals,
...with 3ft. of #6 AWG cable, equipment exposure totals: 464V + 220V = 684V
...with 3ft. of Micro-Z™ cable, equipment exposure totals: 464V + 70V = only 534V
Using 9ft. of Micro-Z™ cable, equipment exposure totals are: 464V + 207V = 671V,
or about the same as three feet of #6 AWG cable.
Why Low "Let-Through" Voltage is Critical
Let-through voltage, which is what the sensitive downstream equipment sees, consists of cable drop + SPD (MOV) drop. MCG’s unique Micro-Z™ approach allows very low let-through voltage. Our protectors have very long life and extraordinary clamping.