Page 736 - Din prodcuts 2020

7/20 ELECTRICAL INSTALL ATION SOLUTIONS FOR BUILDINGS 2CHC 420 001 C0201

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Control and automation
E 450 priority switches

Technical characteristics
E 451-5.7 E 452-5.7
Operating coil
Range of rated current equivalent to 6.7 … 39 A
correlates
1.5 … 9 kW at 230 V, 4.6 … 27 kW at 230/400 V
Threshold current 3.1 … 5.3 A
OFF delay (max.) 0 main half waves 2 main half waves
Max. continuous current 43 A
E 450
Therm. continuous capacity at 40 °C/104 °F 5 W
7
Contact assembly
Control contact 1 NC contact
Rated contact current at 250 V 1 A
Contact material solid silver
Max. switching voltage 400 V
Max. switching capacity 230 VA
Max. switched current 1 A
Max. inrush current peak 5 A
Electr. service life > 10 operations
5
Mechanical service life app. 2 x 10 operations
6
Max. electrical switching rate app. 1800 operations/hour
ON duration 100 %
Ambient temperature – 20 °C/– 4 °F to + 40 °C/104 °F
Response time 10 … 20 ms
Release time 5 … 20 ms ≥ 20 ms
Test voltage contact/coil 2.5 kV
Clearance and creepage distance C/250 V AC cording to IEC 669-1-23
Protection degree IP 40
Protection against electric shock according to DIN VDE 0106 Part 100 (BGV A2)
2
Terminal contact series coil up to 16 mm , control contact up to 2.5 mm 2
E 450 priority switches
The priority switch is used in wiring systems where existing lead cross sections or the size
of the power supply service box do not allow for simultaneous operation of two powerful
loads (e.g. storage heating and flow-type heater).
The priority switch disconnects the long-term load (storage heating) for as long as the
short-term consumer (flow-type heater) is switched on.
The coil of the priority switch is connected in series to the short-term load. When this load is
switched on, the NC contact of the priority switch disconnects e.g. the heating system
contactor.

For pneumatically controlled flow-type heaters
Rated current Power loss Bbn Order details Price Weight Pack
range 4016779 1 1 piece unit

W EAN Type code Order code piece kg pc.
6,7 ... 39 A 2.4 41590 3 E 451- 5.7 A 2CDE160000R0901 0.1 10

For electronically controlled flow-type heaters
Rated current Power loss Bbn Order details Price Weight Pack
range 4016779 1 1 piece unit

W EAN Type code Order code piece kg pc.
6.7 ... 39 A 2.4 20950 2 E 452-5.7 A 2CDE160010R0901 0.1 10