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2CDE160000R0901 ABB E451-5.7A Priority Switch for Pneumatically Controlled Flow-Type Heaters
ABB E451-5.7A is a single-module priority switch with a 6.7-39 A rated current range, designed for automatic load management with pneumatically controlled flow-type heaters and other high-power electrical loads.
£22.74
Why Choose the ABB E451-5.7A Priority Switch?
The ABB E451-5.7A is a compact priority switch for pneumatically controlled flow-type heaters, designed for electrical installations where the available supply capacity or conductor size does not permit two high-power loads to operate simultaneously. As part of the ABB E450 priority switch series, it automatically disconnects a lower-priority load while the priority consumer is operating.
The E451-5.7A uses a current coil connected in series with the short-term priority load. When that load is switched on, the priority switch operates its normally closed control contact to disconnect a contactor controlling the longer-term load, helping manage available electrical capacity without requiring manual intervention.
With a 6.7–39 A rated current range, a maximum continuous current of 43 A and a 1 A control contact rating at 250 V, the E451-5.7A provides dependable load-priority control in building electrical systems. Its compact single-module DIN rail format makes it particularly suitable for distribution-board installation.
Key Advantages
- Automatic priority load management for installations with limited supply capacity.
- Designed specifically for pneumatically controlled flow-type heaters.
- 6.7–39 A rated current range for high-power load monitoring.
- 43 A maximum continuous current.
- Normally closed control contact automatically disconnects the lower-priority load.
- Compact 17.5 mm single-module format for DIN rail distribution boards.
Key Features
- ABB E450 priority switch series.
- 6.7–39 A rated current range.
- 3.1–5.3 A threshold current.
- 43 A maximum continuous current.
- 1 normally closed control contact.
- 1 A rated control contact current at 250 V.
- 400 V maximum switching voltage.
- 230 VA maximum switching capacity.
- IP40 protection rating.
Reliable Priority Load Management
Priority switches are used where the available electrical supply cannot support simultaneous operation of two high-power consumers. The ABB E451-5.7A monitors the priority load through its series-connected current coil and disconnects the lower-priority consumer through its normally closed control contact whenever the priority load is operating.
This arrangement is particularly useful with storage heating and pneumatically controlled flow-type heaters. By temporarily disabling the longer-term load while the short-term high-power appliance is operating, the E451-5.7A helps keep the installation within the available electrical supply capacity.
Typical Applications
- Pneumatically controlled flow-type water heaters.
- Storage heating and instantaneous water-heating systems.
- Electrical installations with restricted supply capacity.
- Residential and commercial distribution boards.
- Automatic high-power load prioritisation.
- DIN rail building control and load-management systems.
Technical Specifications
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| Product Series | ABB Modular | |
|---|---|---|
| Device Type | Accessory | |
| Series | E450 | |
| ABB order code | 2CDE160000R0901 | |
| Product type | Priority switch / load management relay | |
| Application | Pneumatically controlled flow-type heaters | |
| Rated current range | 6.7–39 A | |
| Threshold current | 3.1–5.3 A | |
| Maximum continuous current | 43 A | |
| Control contact | 1 NC | |
| Rated control contact current | 1 A at 250 V | |
| Maximum switching voltage | 400 V | |
| Maximum switching capacity | 230 VA | |
| Maximum switched current | 1 A | |
| Maximum inrush current | 5 A | |
| Response time | 10–20 ms | |
| Release time | 5–20 ms | |
| Protection rating | IP40 | |
| Operating temperature | -20 to +40 °C | |
| Current-coil terminal capacity | Up to 16 mm² | |
| Control-contact terminal capacity | Up to 2.5 mm² | |
| Width | 17.5 mm | |
| Height | 85 mm | |
| Depth | 60 mm | |
| Width in modular spacings | 1 | |
| Weight | approx. 0.1 kg | |
| EAN | 4016779415903 |
Frequently Asked Questions
What is the ABB E451-5.7A used for?
The ABB E451-5.7A is used to prioritise one high-power electrical load over another, automatically disconnecting the lower-priority load while a pneumatically controlled flow-type heater or similar priority consumer is operating.
What is the current range of the ABB E451-5.7A?
The E451-5.7A has a rated current range of 6.7–39 A and a maximum continuous current of 43 A.
What type of heater is the E451-5.7A designed for?
The E451-5.7A is specifically designed for pneumatically controlled flow-type heaters.
How does the ABB E451-5.7A priority switch operate?
Its current coil is connected in series with the priority consumer. When that load operates, the switch opens its normally closed control contact, allowing a contactor to disconnect the lower-priority load.
How much panel space does the E451-5.7A require?
The E451-5.7A is 17.5 mm wide and occupies one modular spacing, making it suitable for compact DIN rail distribution-board installations.
Trusted ABB Load Management
ABB E450 priority switches provide automatic load management where electrical supply capacity is limited, helping coordinate high-power consumers and prevent simultaneous operation of loads that could exceed the available installation capacity.
