NewTrend · DC-coil modular contactors
Product overview
The OCT1-25Z is an 18mm-wide modular contactor for switching AC loads from a low-voltage DC control circuit. Choose a 12V DC or 24V DC coil and either two normally open contacts or one normally open plus one normally closed contact. Its front window indicates the mechanical contact state.
Technical selection summary
| Model | OCT1-25Z |
|---|---|
| Type | DC-coil modular contactor for AC load switching |
| Coil options | 12V DC or 24V DC; polarity-sensitive |
| Contact options | 2NO or 1NO + 1NC |
| AC-7a current | 25A |
| AC-7b current | 9A |
| Operating voltage Ue | 250V AC |
| Insulation voltage Ui | 500V |
| Thermal continuous current Ith | 25A |
| AC-7a power | 5.5kW |
| AC-7b power | 2kW |
| Maximum switching rate | 30 operations per hour |
| Electrical life | 100,000 operations |
| Mechanical life | 1,000,000 operations |
| Mounting | 35mm DIN rail |
| Dimensions | 84mm high × 18mm wide × 68mm deep |
| Outline references | 49mm body depth; 45mm front section |
| Status indication | Front mechanical contact-position window |
Contact configurations
The 2NO version closes both main contacts when the coil is energized. The 1NO + 1NC version combines one closing contact and one opening contact for circuits that require opposite switching states. Select the contact arrangement to match the control design. Product photographs show the 24V DC, 2NO version.
DC coil and wiring
The control coil uses a dedicated 12V DC or 24V DC supply. Observe the positive and negative coil-terminal markings: the illustrated upper coil terminal is positive and the lower terminal is negative. The main contacts switch the separate AC load circuit; coil voltage and load voltage are different circuit ratings.
The wiring illustration shows a 2NO arrangement with incoming conductors at terminals 1 and 3 and outgoing load conductors at 2 and 4. For the mixed-contact version, follow its contact diagram and terminal markings. Isolate both control and load supplies before installation or servicing, tighten the terminals securely and provide suitable upstream circuit protection.
Load ratings and switching duty
The AC-7a rating is 25A and 5.5kW; the AC-7b rating is 9A and 2kW. Rated operating voltage is 250V AC, insulation voltage is 500V and continuous thermal current is 25A. The specified maximum switching rate is 30 operations per hour, with an electrical life of 100,000 operations and mechanical life of 1,000,000 operations.
Dimensions and DIN-rail mounting
The contactor is 84mm high, 18mm wide and 68mm deep. Its outline identifies a 49mm body-depth reference and 45mm front section. Mount it on a standard 35mm DIN rail in a suitable distribution enclosure and allow space for wiring.
Typical applications
For lighting, heating and other household or building-control AC loads operated by a low-voltage DC controller. The compact module and contact-position window suit distribution-board automation and local status checks.
