Search Results:
Search Results:
The Sprecher+Schuh CT7N-23-B75 is a bimetallic thermal overload relay with an adjustment range of 5.5 to 7.5 amps, rated 690V AC and set to trip class 10A under IEC/EN 60947-4-1. The CT7N-23-B75 direct-mounts to CA7-9 through CA7-23 contactors to form a compact starter assembly. Each unit is factory current calibrated at full operating temperature, at both the largest and smallest current in its range.
Motor circuits fail quietly: a pump draws a little more current each month, a conveyor jams under load, or one phase disappears and the winding cooks before anyone notices. A correctly dialled thermal overload relay is the protection standing between that motor and a rewind invoice. The CT7N-23-B75 carries a differential tripping mechanism that senses phase loss and trips at 115% of full load current, ahead of the standard 120% threshold. A built-in compensation bimetal holds that characteristic across an ambient range of -20 to +60 degrees C.
Panel builders and maintenance sparkies stay with the CT7N line because the assembly work is short and the stock list is short with it. One overload block covers five contactor frame sizes from CA7-9 to CA7-23, so a service van carries fewer part numbers and still covers most light industrial work. The selectable manual or automatic reset means the same relay suits a manned line and an unattended pump set. A separate NO signal contact flags a trip back to a PLC on a different voltage from the control circuit.
The CT7N-23-B75 is not a short-circuit protective device and requires back-up fuse protection, rated to a maximum of 25 A gL/gG for this catalogue number. It is rated IP00 and must not be installed outside a panel or enclosure. It cannot be used with true DC contactors, and it is not suitable for motors drawing outside the 5.5 to 7.5 amp setting band.
(CT7N-23-B75)
The CT7N-23-B75 is built to IEC/EN 60947-1, 60947-4-1, and 60947-5-1, with a class 10A trip characteristic. It also carries cULus listing under file E33916 and CSA C22.2 No. 14. Outer housing parts are rated UL94 V0 and the materials are RoHS compliant.
The relay close-couples directly to CA7-9 through CA7-23 contactors, forming a compact starter package. Main terminals are M4 screw type, taking 2 x 1.5 to 4 mm2 fine stranded with ferrule, torqued to 1.5 to 2.2 Nm. A CT7N-37-P-A adapter is available if separate DIN-rail or panel mounting is needed.
The relay mounts to CA7-9 through CA7-23 AC contactors, electronic DC contactors CA7-9E to CA7-55E, and two-winding DC contactors CA7-60D to CA7-97D. It cannot be used with true DC contactors. Check the contactor frame size against the relay catalogue number before ordering.
Set the dial to the motor nameplate full load current for motors with a service factor of 1.15 or greater. For a service factor of 1.0, use 90 percent of nameplate full load current. In a wye-delta starter, multiply the rated operating current by 0.58 before setting.
A differential tripping mechanism inside the relay senses unequal pole currents and trips at 115 percent of full load current, compared with the 120 percent ultimate trip rating under balanced conditions. Under a phase loss condition the three-pole slider mechanism trips in approximately 45 seconds.
The reset switch on the unit selects manual or automatic mode. For remote resetting, a CMR7N remote reset solenoid is available in a range of AC and DC coil voltages. A D7 Reset external reset button suits relays mounted inside enclosures, and a CT7N-RA3 adaptor gives a larger reset actuation surface.
The relay operates from -20 to +60 degrees C, with an ambient compensation bimetal holding the trip characteristic constant across that band. Storage range is -55 to +80 degrees C. Mechanical and electrical life is rated at 0.25 million operations at maximum contact rating. Sparky Direct lists a one year warranty.
The Sprecher+Schuh CT7N-23-B75 is available online from Sparky Direct, with Australia-wide delivery to any state or territory including regional areas. Sparky Direct is an Australian electrical wholesaler established in 2005, supplying more than 500,000 customers with transparent trade pricing.
100-Day Fuss-Free Returns
We want you to love what you buy—but if you change your mind, that’s okay too. That’s why Sparky Direct offers a 100-day money-back guarantee.
If your item isn’t in its original condition, please contact us before returning it—we might save you time and money.
All products come with a manufacturer’s or supplier’s warranty
Damaged or Faulty Goods
If your order arrives damaged or is faulty, let us know within 24 hours.
Contact us via our chat to arrange the return.
Exclusions
We can’t accept returns for:
How to Request a Return
The warranty starts from the Invoice Date.
Domestic Use: 1 Year
Commercial Use: 1 Year
Warranty Method: Return to Sparky Direct
| Specification | Details |
|---|---|
| UNSPSC CLASS | 39122300 |
| UOM | EA |
| CONTACT CONFIGURATION | 1 Normally Opened & 1 Normally Closed |
| CONTROL TYPE | Automatic/Manual |
| FREQUENCY | 50/60 Hz |
| FOR USE WITH | CA7-9 to CA7-23 Contactors |
| MOUNTING METHOD | Direct |
| PLEASE NOTE | 1 Phase |
| OPERATIONAL VOLTAGE | 690 Volt AC |
| SETTING RANGE TO (AMP) | 7.5 |
| PRODUCT TYPE | Contactor Overloads |
| TERMINAL CONNECTION | Screw |
| TIGHTENING TORQUE | 1.5-2.2 N/m |
| TEMPERATURE | -20 to 60 deg C |
| SETTING RANGE FROM (AMP) | 5.5 |
| TRIP CHARACTERISTIC | Class 10A |
These specifications and characteristics outline physical, mechanical, electrical details.
| Brand | Sprecher + Schuh |
| SKU | CT7N-23-B75 |
| Barcode # | 10662074718754 |
| Package Weight | 0.142kg |
| TYPE | VALUE |
|---|---|
| Type | Thermal Overload Relay |
| Brand | Sprecher+Schuh |
| Rated Current (A) | 5.5 - 7.5 |
| Mounting | Direct Mount to Contactor |
| Voltage (V) | 690 |
| Number of Poles | 3 |
| IP Rating | IP00 |
Electrical and HVAC products sold by Sparky Direct are intended for installation by licensed and appropriately qualified professionals in accordance with applicable Australian Standards and regulatory requirements. Customers are responsible for ensuring that any product purchased, including any related or associated components, is compatible and suitable for their intended installation and application.
Sparky Direct does not provide installation advice and does not assess product suitability for individual circumstances unless expressly confirmed in writing. Customers must confirm correct product selection, compatibility, compliance, and suitability with a licensed or appropriately qualified professional prior to purchase.
Tools sold by Sparky Direct must be used safely and in accordance with the manufacturer’s instructions. Customers are responsible for ensuring they have the necessary knowledge and competence to operate any tool purchased. If you are unsure how to safely or correctly use a tool, do not use it and seek guidance from the manufacturer or a suitably qualified professional.
Nothing in this clause limits or excludes any rights or guarantees available under the Australian Consumer Law.
For website terms and conditions https://www.sparkydirect.com.au/terms-of-use
Help other Sparky Direct users shop smarter by writing reviews for products you have purchased.
$59.92 $54.47 ex. GST
$193.00 $175.45 ex. GST
$70.21 $63.83 ex. GST
$212.91 $193.55 ex. GST
$75.34 $68.49 ex. GST
$166.38 $151.25 ex. GST
$44.87 $40.79 ex. GST
$18.64 $16.95 ex. GST
