NewTrend · DIN-rail digital frequency meter
Product overview
The TO-1H is a single-phase digital frequency indicator with a 0–99Hz display range. It occupies one 18mm module on a standard 35mm DIN rail and uses the AC input at terminals 1 and 2. The original material illustrates opaque and transparent front covers; the gallery and drawings here show the opaque version.
Technical specifications
| Model | TO-1H |
|---|---|
| Function | Single-phase digital frequency indication |
| Measurement range | 0–99Hz |
| Supply / measurement voltage reference | AC 40–500V |
| Rated frequency reference | 50/60Hz |
| Measurement accuracy reference | 1.0 |
| Display | LED digital display |
| Supply terminals | 1–2, as marked on the housing |
| Current sensing | Not applicable; frequency is sensed from the AC input |
| Mounting | 35mm DIN rail |
| Front outline | 81mm height × 18mm width |
| Storage-temperature reference | −25°C to +70°C |
| Package | One frequency meter |
| Illustrated measuring interval | 500ms per reading |
| Illustrated protection reference | IP20 |
| Illustrated operating-temperature reference | −25°C to +70°C |
Input terminals and connection
The housing diagram connects the frequency input across terminals 1 and 2. The original installation drawing illustrates both an L+N connection and an L+L connection. The applied AC voltage must remain within the stated AC40–500V input range.
Front-cover versions
Choose Opaque or Transparent to match the enclosure appearance required. Both cover types are supported by the original product photographs. The displayed gallery uses the opaque unit as the reference; front-cover selection does not change the stated measurement function.
Dimensions and DIN-rail installation
The supplied front outline gives an overall height of 81mm and a width of 18mm for both illustrated cover types. The rear yellow clip fixes the instrument to a 35mm rail. The source does not provide a verified overall-depth figure.
Operating and storage references
The written product description lists a storage range of −25°C to +70°C and a rated-frequency reference of 50/60Hz. The illustrated parameter table separately gives a 0–99Hz frequency range, a 500ms measuring interval, IP20 and an operating-temperature reference of −25°C to +70°C. These are retained as separate original references.
Applications and supplied items
Use the frequency indicator for local AC frequency observation in distribution panels and electrical control assemblies. The original package includes one frequency meter. The source description uses the short name TO-H, while the photographed side label and parameter table identify the unit as TO-1H.
