• black icon of a bullhorn 30 years industry experience
  • black icon of three cubes Over 8,000 products in stock
  • Black icon of a clock Order by 16:00 and receive the next working day

CROUZET CONTROL

Frequency control relay HHZ

The HHZ control relay monitors frequency variations in 50-60 Hz power networks. Both under- and over-frequencies can be detected by setting two independent limit values. It has two relay outputs, one for each limit value. The switch on the front is set to either 50 or 60 Hz and whether with memory or without memory is preferred. If with memory is selected, the supply voltage must be switched off to restart the relay. The switch position and consequently the relay's function mode is detected when the supply voltage is switched on. If the switch is in an incorrect position when the power is switched on, the component enters error mode. The output remains unaffected and the LED indication flashes to indicate the incorrect position. If the switch position is changed during operation, all LEDs begin to flash but the relay will continue to function normally with the frequency set that was at the most recent power connection. The relay monitors its own operating voltage. The limit value for under-/over-frequency is set with two potentiometers that are scaled based on how much the network frequency may deviate from the set value. There is also a switch that can be used to double the control range. The time delay (Tt), which is adjustable between 0.1 and 10 s. is used to ignore temporary network disturbances. When the time delay is active, either R1 or R2 flashes for a set period. The control relay has a static hysteresis of 0.3 Hz. If the power is switched on with a measured fault, the relay remains unaffected. Green LED (Un) indicates supply voltage OK. Yellow LED (R) indicates active relay output.

Read more
  • Control of frequency 50-60 Hz ac network
  • Over-/under-frequency with two relay outputs
  • 35 mm cabinet with DIN rail
  • LED indication

Selected variant

Selected variant

Technical data

Approvals CE, CSA, GL, RoHS, UL
Breaking capacity 5A, 250V AC/DC
IP class connection IP20
IP class housing IP30
Lower limit +2 - -10 Hz
Output 2x Relay
Storage temperature max 70 °C
Storage temperature min -40 °C
Supply voltage 120-277V AC
Temperature operational max 50 °C
Temperature operational min -20 °C
Time delay startup 0,5 s
Time delay when exceeding the limit value 0,1-10s
Upper limit -2 - 10 Hz
Weight 100 g

Measurements and connections

Technical illustrations

Control relay Over/under-frequency with memory

Over/under-frequency with memory
1: Upper limit value
2: Lower limit value
3: Relay (R1)
4: Relay (R2)
5: Hysteresis
6: Frequency
7: Time delay (Tt)

Control relay over/under-frequency without memory

Over/under-frequency without memory
1: Upper limit value
2: Lower limit value
3: Relay (R1)
4: Relay (R2
5: Hysteresis
6: Frequency
7: Time delay (Tt)

Product description

The HHZ control relay monitors frequency variations in 50-60 Hz power networks. Both under- and over-frequencies can be detected by setting two independent limit values. It has two relay outputs, one for each limit value. The switch on the front is set to either 50 or 60 Hz and whether with memory or without memory is preferred. If with memory is selected, the supply voltage must be switched off to restart the relay. The switch position and consequently the relay's function mode is detected when the supply voltage is switched on. If the switch is in an incorrect position when the power is switched on, the component enters error mode. The output remains unaffected and the LED indication flashes to indicate the incorrect position. If the switch position is changed during operation, all LEDs begin to flash but the relay will continue to function normally with the frequency set that was at the most recent power connection. The relay monitors its own operating voltage. The limit value for under-/over-frequency is set with two potentiometers that are scaled based on how much the network frequency may deviate from the set value. There is also a switch that can be used to double the control range. The time delay (Tt), which is adjustable between 0.1 and 10 s. is used to ignore temporary network disturbances. When the time delay is active, either R1 or R2 flashes for a set period. The control relay has a static hysteresis of 0.3 Hz. If the power is switched on with a measured fault, the relay remains unaffected. Green LED (Un) indicates supply voltage OK. Yellow LED (R) indicates active relay output.

Accessories

Related

Katko switch disconnectors
Product news

Switch disconnectors from Katko

We have now added switch disconnectors to our range! Switch disconnectors contribute to the overall functionality and safety of electrical systems.

Lutz loccbox mini circuit breaker
Product news

LUTZE LOCC-Box

LOCC-Box from Lutze is an intelligent current monitoring device that provides reliable protection of DC circuits in a slimline 8.1mm housing.

Push In Technology such as push-in terminals, push-in sockets, and even push-in heaters.
Blog

The Push In Technology You Need at OEM Automatic

OEM Automatic has integrated push-in technology into it's product offering for many years now. In this blog post, we'll explore the various benefits of push-in technology and some of the products we offer that make use of this innovation, such as push-in terminals, push-in sockets, and even push-in heaters.

Kubler encoders and process displays
Blog

Combine Encoders and Process Displays with Kubler

We present Kublers ultimate package: Encoders and Process Displays, which can be used together to create efficient processes.

DF Electric is a company that specializes in the production of electrical components, including fuses fuse holders and transformers
Product news

DF Electric Fuses, Fuse holders and Transformers

Let’s tell you a little about DF Electric – our supplier of fuses, fuse holders and transformers, and how they are a simple but essential product for all users of electrical components.

Visit OEM and AGRO at Vehicle Electrification Expo
Company news

Join us at Vehicle Electrification Expo in Birmingham

OEM Automatic is thrilled to announce its participation in the UK's largest dedicated event for electric and hybrid vehicles - the Vehicle Electrification Expo! We will be exhibiting with our supplier, Agro, to showcase EV EMC cable gland solutions for sustainable and eco-friendly practices. Find us on stand 921 with Agro.

Parts Price

Selected variant

Select a variant in the list

Contact us

If you need any help, you can contact us in one of the following ways:

phone 0116 284 9900

Send an e-mail Send an e-mail

comments Use live chat