| Part Number: | C | DH | 48 | S | - | 1Z | 3 |
|---|---|---|---|---|---|---|---|
| Explanation: |
Prefix C - Fixed brand prefix |
Product Series DH - Timer relay series |
Front Size 48 - 48×48mm |
Mounting Format S - Panel or 35mm DIN rail mounting |
Working Mode 1Z - One timed output with reset and pause |
Rated Supply Voltage Omitted - 100–240VAC |
CDH timer relays use a four-digit display and front preset switches for on-delay or repeating-cycle control. Select the output function, reset/pause capability and mounting format before choosing the supply. The range includes 48×48mm CDH48S/CDH48M and 72×72mm CDH72M versions.
| Function code | Outputs and operation | Reset / pause |
|---|---|---|
| 1Z | One timed relay output | Both |
| 2Z | Two timed relay outputs | Not included |
| 2ZT | Two timed relay outputs | Both |
| S | One repeating-cycle timed output | Both |
| 2S | Two repeating-cycle timed outputs | Not included |
| 2ST | Two repeating-cycle timed outputs | Both |
| 2ZH | One timed output and one instantaneous output | Not included |
| Function | 48mm S mounting | 48mm M mounting | 72mm M mounting | Standard supply |
|---|---|---|---|---|
| 1Z | CDH48S-1Z | CDH48M-1Z | CDH72M-1Z | 100–240VAC |
| 2Z | CDH48S-2Z | CDH48M-2Z | CDH72M-2Z | |
| 2ZT | CDH48S-2ZT | CDH48M-2ZT | CDH72M-2ZT | |
| S | CDH48S-S | CDH48M-S | CDH72M-S | |
| 2S | CDH48S-2S | CDH48M-2S | CDH72M-2S | |
| 2ST | CDH48S-2ST | CDH48M-2ST | CDH72M-2ST | |
| 2ZH | CDH48S-2ZH | CDH48M-2ZH | CDH72M-2ZH |
| Position | Code | Meaning |
|---|---|---|
| 1: Prefix | C | Fixed brand prefix |
| 2: Series | DH | Timer relay series |
| 3: Front size | 48 | 48×48mm |
| 72 | 72×72mm | |
| 4: Mounting | S | Panel or 35mm DIN rail mounting |
| M | Panel mounting | |
| 5: Working mode | 1Z / 2Z / 2ZT / S / 2S / 2ST / 2ZH | Output and control functions in the function table |
| 6: Supply | Omitted | 100–240VAC |
| 1 | 24–48VDC | |
| 2 | 12VDC | |
| 3 | 380VAC | |
| 4 | 12VAC | |
| 5 | 24VAC | |
| 6 | 36VAC | |
| Custom numeric combination | Custom voltage identified by the ordered specification |
The complete model table lists the established 48S, 48M and 72M combinations. Supply suffixes follow the function code; omission is the standard 100–240VAC version.
| Range selection | CDH48S default timing range |
|---|---|
| H | 1min–99h99min |
| M | 1s–99min99s |
| S | 0.01–99.99s |
| Range selection | CDH48S-S cycle timing range |
|---|---|
| 0.1S | 0.1–9.9s |
| S | 1–99s |
| 0.1M | 0.1–9.9min |
| M | 1–99min |
| 0.1H | 0.1–9.9h |
| H | 1–99h |
| 10H | 10–990h |
Set the time base and preset value before applying power. For the S cycle function, T2 times first; its two right-hand display digits and indicator are active. At T2 expiry the relay operates and T1 is displayed on the left. At T1 expiry the relay releases and T2 starts again.
| Parameter | Rating or condition |
|---|---|
| Display | Four-digit numeric display |
| Standard rated supply | 100–240VAC, 50Hz |
| Contact capacity | 5A at 250VAC |
| Utilization ratings | AC-15: 3A at 250VAC or 380VAC; DC-12: 3A at 24–48VDC |
| Repeat error for delay above 1s | Er ≤1% |
| Repeat error for delay below 1s | Dr ≤50ms |
| Ambient temperature | −25 to +70°C |
| Relative humidity | 35–95%RH, non-condensing; allowable humidity decreases as temperature rises |
| Connection formats | Terminal-block and plug-in arrangements, according to model |
| Altitude | ≤2000m |
| Restart interval | ≥0.5s |
| Conformity references | CCC: GB/T14048.5; CE: EN60947-5-1; applicable documents depend on the ordered model |
Reset returns the timer to its initial state. Pause stops timing and holds the displayed value; opening the pause connection resumes timing. These functions apply to the variants listed with reset/pause. Use shielded signal wiring where reset or pause leads are long or exposed to strong electrical interference. Do not apply external voltage to the reset or pause terminals.
| Format | Front size | Dimension references | Panel cutout | Minimum adjacent spacing |
|---|---|---|---|---|
| CDH48S | 48×48mm | Listed overall shell: 48×48×103mm; side drawing: 6.5 front projection, 67.9 body reference, 55.3 retaining-clip envelope | 45×45mm, +0.6/0 | 65mm horizontally and vertically |
| CDH48M | 48×48mm | Side drawing: 6.5 front projection, 67.9 body reference, 55.3 retaining-clip envelope | 45×45mm, +0.6/0 | 65mm horizontally and vertically |
| CDH72M | 72×72mm | Listed overall shell: 72×72×81mm; side drawing: 6 front projection, 65 body reference, 67 body height | 68×68mm, +0.7/0 | 90mm horizontally and vertically |
All numerical drawing references above are in millimetres. Overall shell dimensions and side-profile references describe different extents; allow room for the selected terminal or socket arrangement.
Pull the cover outward at the recessed areas on both sides, set the delay value and time base, and close the cover. Wire to the housing diagram and check the selected supply voltage and frequency. Apply power after presetting; changes made after power-on do not change the active preset.
For a single-phase load, the illustrated direct-switching application is limited to ≤3A resistive or ≤0.5A inductive current. Larger loads use an AC contactor. The three-phase examples use either a 380VAC timer and contactor supply or a 220VAC control supply with neutral. In these examples the load energizes when supply is applied and switches off after the preset interval through the selected contact path.
These industrial timers are not intended for exceptionally high-reliability nuclear, gas or power systems; personal or property safety functions; harsh outdoor, contaminated, electromagnetic, vibration or shock environments; fire or explosion hazards; or military and aerospace applications unless specifically designed for that use and confirmed in writing.
