·Scope and Application
The BAL (XELB, KZL) series of mining explosion-proof interlocking electric bells with sound and light combination are suitable for use in environments with explosive mixtures of gases such as methane and coal dust in underground coal mines and their surrounding media. They are used in power lines with AC 50Hz and power supply up to 127V to transmit warning signals locally or remotely through sound or sound and light signals.
·Model and meaning

·Main technical parameters:
| Model, Specifications |
Rated voltage (V) |
Rated current (A) |
Sound radius (m) |
Visible distance (m) |
Maximum outer diameter of cable (mm) |
Dimensions (mm) |
Remark |
| BAL1-36 |
thirty-six |
zero point nine |
one hundred and fifty |
- |
φ10.5 |
300×185×95 |
Original XELB |
| BAL1-127 |
one hundred and twenty-seven |
zero point three five |
one hundred and fifty |
- |
φ10.5 |
| BAL2-36 |
thirty-six |
zero point nine |
one hundred and fifty |
thirty |
φ10.5 |
490×150×130 |
Original KZL |
| BAL2-127 |
one hundred and twenty-seven |
zero point three five |
one hundred and fifty |
thirty |
φ10.5 |