Z3I041, Z3I121 Surge protector set
(supersedes Z3I040, Z3I120)
76
Building Technologies
001260_k_en_--.doc
Fire Safety & Security Products
02.2005
16
Z3I041, Z3I121 Surge protector set
(supersedes Z3I040, Z3I120)
16.1 Overview
z
Additional protection against surge voltage peaks in the mains lead (Option)
z
2 different surge protector sets available
Z3I041 –> 230 VAC
Z3I121 –> 120 VAC
16.2 Application
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In systems particularly at risk from lightning, such as transformer systems or al-
pine transmitter stations etc.
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Z3I121 can also be used as a supplementary measure against static discharge
on detection lines or data lines
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1 surge protector set per switchgear cabinet or per mains lead is enough
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1 central neutral point per system
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for detailed information see document 1683
16.3 Functions
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The EnerPro...CG over voltage limiters is equipped with 2 cut-off devices (AT).
Upon applying the operating voltage, a green LED indicates operational avail-
ability.
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The circuit is also so designed that only the surge protector is disconnected from
the mains. Operational availability of the system to be protected continues to be
provided.
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Malfunction of the surge protector is indicated by the quenching of the green
LED. The EnerPro must be replaced.
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If the varistor indicate too high leakage currents due to overloading, they are
disconnected from the mains by the AT. As the EnerPro are over dimensioned
for the other effects of lightning, this case will seldom arise.
Function of the fuse
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Essential to interrupt the mains lead. Only use slow-blow fuses ”with high break-
ing capacity”. Depending on the degree of fuse protection required for the mains
lead, uses fuse rating of between 0.8 A and 10 A.
