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5/74 ELECTRICAL INSTALL ATION SOLUTIONS FOR BUILDINGS 2CHC 420 001 C0201

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Protection and safety
OVR surge protective devices – UL Version
Selection tables

Choosing the correct model Complete facility protection
Installing surge protection at the main distribution panel is
1) Determine the service voltage only the beginning of protecting the entire operation. As
5
Consult qualified personnel if the facility or operation ser- most transient surges are created internally, it is necessary
vice voltage is unknown. to install surge protection at sub-distribution panels (equip-
ment protection) to be fully protected. Stepping down the
2) Select the SPD maximum continuous operating voltage Imax level from the service entrance panel toward equip-
(MCOV, Uc) ment to be protected is recommended.
The MCOV should correspond to the service voltage. For example, if a 40 kA Imax SPD is installed in the main dis-
Example: If the service voltage is 480 V Delta, an SPD with tribution panel, then 15 kA Imax SPDs should be installed in
550 V or 660 V MCOV will be required. sub-distribution panels for equipment protection.
Surge protection devices must also provide a level of protec-
tion compatible with the withstand voltage of the equip- Coordination
ment. This withstand voltage depends on the type of equip- It may be necessary to add a second surge protector, wired
ment and its sensitivity. The incoming surge protector may to the incoming unit, to achieve the required voltage protec-
not provide adequate protection by itself, as certain electri- tion and/or surge capacity. For Type 2 or 4 SPDs, installing
cal phenomena may greatly increase its residual voltage if this second unit a minimum of 1 m from the first unit will al-
cable lengths exceed 10 m. A second SPD may be necessary. low the two to work together, achieving the required protec-
tion.
3) Select the SPD surge capacity (Imax)
Surge capacity is the amount of energy the SPD can with- Wiring rules
stand from a single surge event. The higher the surge capac- The impedance of the cables increases the voltage across
ity, the longer the device will protect the system. A second the connected equipment. Therefore, the length of the cable
surge protector may be required if the surge capacity of the between the surge protector and the equipment should be
first is not capable of diverting all surge current to ground. minimized.
See coordination below. The surge protective device should be installed as close to
the equipment to be protected as possible. If this is not pos-
4) Remote monitoring (Optional) sible (the equipment is over 30 m from the panel), then
Integrated auxiliary contact for remote monitoring available a second surge protector must be installed.
on models with "TS" designation. Consult "Selection tables"
on next page for help in the selection of SPDs.

Pro- Impulse Max. Nominal Follow Voltage Nominal Max. cont. Type Order code
tected current discharge discharge current protection voltage operating
lines current current interrupting Rating voltage
Iimp rating
10/350 Imax 8/20 In Ifi VPR Un MCOV
kA kA kA kA kV V V
Type 2 - Pluggable - Single Pole networks
1 – 15 5 – 0.6 120 150 OVR T2 15-150 P U 2CTB802341R0000
1 – 15 5 – 1 277 ±15% 320 OVR T2 15-320 P U 2CTB802341R0400
1 – 40 20 – 0.6 120 150 OVR T2 40-150 P U 2CTB802341R2000
1 – 40 20 – 0.6 120 150 OVR T2 40-150 P TS U 2CTB802341R2100
1 – 40 20 – 1 277 ±15% 320 OVR T2 40-320 P U 2CTB802341R2400
1 – 40 20 – 1 277 ±15% 320 OVR T2 40-320 P TS U 2CTB802341R2500
1 – 40 10 – 1.3 347 ±15% 440 OVR T2 40-440 P TS U 2CTB802341R2900
1 – 40 10 – 1.7 480 ±15% 550 OVR T2 40-550 P TS U 2CTB802341R3300
1 – 40 10 – 1.9 600 ±15% 660 OVR T2 40-660 P TS U 2CTB802341R3700
Neutral
1 – 70 20 0.1 1.2 230 275 OVR T2 70 N P U 2CTB802341R8000
Cartridges
1 – – – – – 120 ±15% 175 OVR T2 15-150 C U 2CTB802348R2500
1 – – – – – 277 ±15% 320 OVR T2 15-320 C U 2CTB802348R2700
1 – – – – – 120 ±15% 175 OVR T2 40-150 C U 2CTB802348R3500
1 – – – – – 277 ±15% 320 OVR T2 40-320 C U 2CTB802348R3700
1 – – – – – 347 ±15% 440 OVR T2 40-440 C U 2CTB802348R3900
1 – – – – – 480 ±15% 550 OVR T2 40-550 C U 2CTB802348R4100
1 – – – – – 600 ±15% 660 OVR T2 40-660 C U 2CTB802348R4300
1 – – – – – 230 275 OVR T2 70 N C U 2CTB802348R6500