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MCBs technical details
S800 range features

The S800S, -N, -C, -B and -HV high performance MCBs: safe innovation
The S800 high performance MCB limits energy and current in case of a short-circuit power
cutt off. The specially designed double arcing chamber system, i. e. per pole are two arcing
chambers, ensures excellent operating characteristics. The new S800B has only one arcing
chamber. Additional exceptional features of the S800 series are:

Convincing: Selectivity to upstream overcurrent protection devices due to a
total switch-off time of only ≤ 2.5 ms.
Safe: Excellent backup protection by limiting the energy to a value
≤ 100 000 A s (125A /50 kA). In case of short-circuit, there is
2
a low load to the circuit and the location of the damage due to the
high limitation of the let-through energy.
Loads: Up to 125 A rated current
Checked: S series up to 50 kA rated ultimate short-circuit breaking capacity I
cu
N series up to 36 kA rated ultimate short-circuit breaking capacity I
cu
C series up to 25 kA rated ultimate short-circuit breaking capacity I
cu
B series up to 16 kA rated ultimate short-circuit breaking capacity I
cu
HV series up to 4 kA rated ultimate short-circuit breaking capacity I cu
Selectable: Characteristics:
S series: B, C, D, K, KM, UCB, UCK
N series: B, C, D
C series: B, C, D, K
B series: B, C, D, K
HV series: C, K
Compact: Slight 27 mm width per pole
Flexible: Accessories installed by the customer.

S800UP, -U, -U-UCZ, -U-PVS: Highest safety now also ensured for UL applications
Convincing: Covering of different voltage ranges
(240 V AC, 480Y/277 V AC, 600 V DC, 1000 V DC)
Safe: Excellent backup protection due to limitation of energy.
Loads: Up to 100 A rated current
Checked: K-, Z series up to 50kA breaking capacity
UCZ series up to 10kA breaking capacity
PVS series up to 3kA breaking capacity
Selectable: Characteristics:
K, Z, UCZ, PVS
Compact: Smallest sizes.
Flexible: Accessories installed by the customer.
Standards: UL489, UL489B, IEC 60947-2

Short description
Two triggers detect overcurrents, effect the switching station and
provide short-circuit protection.
1. The thermal trip for overload protection with time delay.
2. The electromagnetic fast-acting trip with concrete anchor
for short-circuit protection.
UB
iD
t
I x √2 peak value of the prospective short-circuit current
tk k
Un
i max. let-through current of the S800 high performance MCB
D
U supply voltage
n
1 sinus half-wave U build up and collapse of the arc voltage
50 Hz ⩠ T/2 = 10 ms B
t Turn-off time of S800 high performance MCB
K