Design Guide for Hazardous / Industrial
Self-regulating trace heating systems
21-5400-7D0001/-
05/2023-EHT-466854
Notice Technical data subject to change without notice.
No claims for damage arising from alternations, errors or misprints shall be allowed.
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Trace heater Installation Enclosure as Power Box kit
Junction box with mounting stand
PBS-200-E
/-E10 / -E16
PBS-300-E
/-E10 / -E16
PBM-200-E
/-E10 / -E16
PBM-300-E
/-E10 / -E16
PBTW-200-E
PBTW-300-E
PBTC-200-E
PBTC-300-E
Max. workpiece
temperature mounting
stand
2
+240 °C
-
+240 °C
-
+240 °C
-
+240 °C
-
Max. trace heater entries
2
1
3
3
2
1 (3
3
)
1
1
Terminals
Spring clamp Ex e; 2x3
lines, 1x3 PE
Spring clamp Ex e; 3x3
lines, 2x3 PE
Spring clamp Ex e; 4x3 lines,
2x3 PE
Spring clamp Ex e; 2 x lines,
2 x neutral, 2 x PE
Maximum circuit breaker
size
4
32 A
16 A
32 A
Power supply
max. 277 Vac
Ambient temperature range
-55 °C to +55 °C
-40 °C
Min. installation temperature
-55 °C
-40 °C
Power supply cable
Service temperature at con-
ductor
5
HSB+, HTSB:
70 °C @ Ta max 40 °C
80 °C @ Ta max 55 °C
Ingress Protection
IP 66
IP 64; IP 66 (EN 60529)
Connection Technology (CAK)
Maximum withstand tem-
perature / max. service tem-
perature end seal
+200 °C
Min. installation tempera-
ture
-60 °C
Connected
trace
heater type
Trace
heater
rated
power out-
put [W/m]
T
amb max
[°C]
Limitation of operating current (stady state) of trace
heating circuit at T
amb max
[A]
Max. surface temperature
“T
L
” [°C]
T-class
PBS/PBM
PBTC
PBTW **
Installation
enclosure
#
Trace
heater ##
System
###
HSB+
10, 15, 30,
45, 60
+40
20
19
16
+110
+200
T3
+55
18
*12
16
+110
+200
T3
75
+40
20
19
16
+110
+300
T2
+55
18
*12
16
+110
+300
T2
HTSB
10, 15, 30,
45, 60
+40
20
19
16
+110
+200
T3
+55
18
*12
16
+110
+200
T3
75, 90
+40
20
19
16
+110
+300
T2
+55
18
*12
16
+110
+300
T2
2
Maximum workpice temperature depending on the type of trace heater, used
3
On request
4
Protecting of all components of the branch circuit against over-current; choice depending on design parameters
5
For supply cable type selection, the permissible operating temperature at the conductor is to be observed with respect to the maximum ambient temperatue of the power box.
