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| PartNumber | ZT028LDCTR30 | ZT028LDCTR15 | ZT028LDCTB |
| Description | Audio Indicators & Alerts ALARM+LED 28 Vdc; Loud;Red;Cont.;30sec | Audio Indicators & Alerts ALARM+LED 28 Vdc; Loud;Red;Cont.;15sec | AUDIO PIEZO IND 20-28V PNL MNT |
| Manufacturer | Mallory Sonalert | Mallory Sonalert | Mallory Sonalert Products Inc. |
| Product Category | Audio Indicators & Alerts | Audio Indicators & Alerts | Buzzers |
| RoHS | Y | Y | - |
| Product | Buzzers | Buzzers | - |
| Sound Pressure Level | 95 dBA | 95 dBA | 85dB @ 20V, 61cm |
| Tone | Continuous, 30 s | Continuous, 15 s | - |
| Frequency | 3.7 kHz | 3.7 kHz | 3.7kHz |
| Voltage Rating | 28 V | 28 V | - |
| Current Rating | 40 mA | 40 mA | - |
| Termination Style | Screw | Screw | - |
| IP Rating | - | - | - |
| Diameter | 30.74 mm | 30.74 mm | - |
| Dimensions | 30.74 mm L x 30.74 mm W x 43.45 mm H | 30.74 mm L x 30.74 mm W x 43.45 mm H | 22 mm L x 22 mm W x 43.5 mm H |
| Mounting | Panel | Panel | - |
| Height | 43.45 mm | 43.45 mm | 43.5 mm |
| Length | 30.74 mm | 30.74 mm | 22 mm |
| Series | ZT | ZT | ZT |
| Width | 30.74 mm | 30.74 mm | 22 mm |
| Brand | Mallory Sonalert | Mallory Sonalert | - |
| Length in | 2.234 in | 2.234 in | - |
| Length mm | 56.75 mm | 56.75 mm | - |
| Product Type | Audio Indicators & Alerts | Audio Indicators & Alerts | - |
| Factory Pack Quantity | 10 | 10 | - |
| Subcategory | Audio Devices | Audio Devices | - |
| Unit Weight | 1 oz | 1 oz | 1 oz |
| Packaging | - | - | Bulk |
| Termination | - | - | Screw Terminals |
| Driver Circuitry | - | - | Indicator, Internally Driven |
| Technology | - | - | Piezo |
| Input Type | - | - | DC |
| Voltage Rated | - | - | - |
| Voltage Range | - | - | 20 ~ 28V |
| Operating Mode | - | - | Continuous |
| Current Supply | - | - | 40mA |
| Operating Temperature | - | - | -30°C ~ 65°C |
| Washable | - | - | No |
| Port Location | - | - | Top |
| Mounting Type | - | - | Panel Mount |
| Size Dimension | - | - | 30.7mm Dia x 56.8mm H |