Haydon HAY-MPRACDC-8A Universal AC/DC DPDT Relay Module 8A with Automatic Voltage Selection
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution and frame rate settings. Finally you can often make your storage space last a lot longer by enabling motion detected recording rather than continuous, especially if there are long periods of no activity.
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb we recommend a minimum of 2 Terabytes per 4 x 2-4MP HD cameras, as this should give you 2 weeks to a month with a few adjustments on motion detected recording. You may only require the full 25 frames per second on certain cameras if things are fast moving.
(All of our hard drives come fitted and are CCTV specific from one of the major brands)
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Haydon HAY-MPRACDC-8A Universal AC/DC DPDT Relay Module 8A with Automatic Voltage Selection
The Haydon HAY-MPRACDC-8A is a compact universal AC/DC relay module engineered for professional security, access control, CCTV and building management installations. Designed to provide reliable voltage-free (dry contact) switching, the module enables low-voltage control circuits to safely switch higher-current electrical loads whilst maintaining complete electrical isolation between the control and switching circuits.
Unlike conventional relay modules that require separate AC and DC versions, the HAY-MPRACDC-8A automatically detects the input supply, operating from 9–30V AC or 10.5–36V DC without requiring jumper links or manual configuration. Its non-polarity-sensitive design further simplifies installation, reducing wiring errors and making it suitable for a wide range of security and automation systems.
The module incorporates a DPDT (Double Pole Double Throw) relay with contacts rated at 8A, capable of switching loads up to 240V AC or 30V DC. This allows installers to control two independent circuits simultaneously or use changeover contacts for more advanced switching applications. The relay can be triggered directly from a power supply, high-level signal or low-level signal, providing exceptional installation flexibility.
KEY FEATURES
- Universal AC/DC relay module
- Operates on 9–30V AC or 10.5–36V DC
- Automatic voltage selection
- No jumper links required
- Non-polarity-sensitive input
- DPDT (Double Pole Double Throw) relay
- Contact rating up to 8A
- Switches up to 240V AC or 30V DC
- Triggered by power supply, high or low signal
- LED relay status indicator
- Energy-saving relay coil
- Low nominal coil current
- Compact installation design
- Ideal for CCTV, access control and automation systems
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