HB-320 Rugged Waterproof Blasting Machine
MTi GROUP's HB-320: foolproof, secure, and quick connections. Its user-friendly design and sturdy construction ensure reliability in critical situations.
Live pricing and same-day-ship priority once you're in. Setup takes 60 seconds — we just need to confirm you're a real operation.
- P.O.
Why HB-320 Rugged Waterproof Blasting Machine
High-energy discharge
Delivers up to 320 detonator capacity with a high-voltage pulse. Fires large rounds reliably.
Why it matters: One machine handles your biggest shots. No daisy-chaining units or splitting circuits.
Secure lead attachment
Heavy-duty binding posts lock leads firmly in place. Vibration won't shake them loose.
Why it matters: Solid connections mean reliable firing. No re-checks because a wire slipped at the post.
Waterproof construction
Fully sealed housing rated for submersion. Rain, mud, and dust stay out.
Why it matters: Keeps firing in the worst weather your site throws at it. No downtime waiting for dry conditions.
Rapid charge system
Charges to full firing energy in seconds. Visual indicator confirms ready status.
Why it matters: Faster cycle between charge and fire. You're not standing in the open waiting on a slow capacitor.
4 AA battery power
Runs on four standard AA batteries. Easy to source, easy to replace in the field.
Why it matters: No proprietary battery packs to order. Restock from any store and keep the machine working.
Heavy-duty operation
Built for continuous use on large surface operations. Handles repeated high-energy cycles.
Why it matters: A machine that lasts through heavy daily use without degradation. Reliable round after round.
Built for the bench.
Waterproof
Fully sealed against water and dust ingress. Built for harsh field conditions.
Rugged housing
Drop-resistant case. Survives the abuse of being moved between benches.
Reliable firing
Proven electric initiation across surface and underground operations.
Built for every condition.
Wet conditions
Designed for the worst weather. Rain, snow, dust — the HB-320 fires through it.
Underground operations
Compact enough for tight workings, sealed enough for wet headings.
Specs, storage & more.
| FIRING ENERGY | FIRING CAPABILITY: FIRING CAPACITY: |
| FIRE CIRCUIT | ARMED INDICATOR: CHARGING TIME: |
| DIMENSION | WEIGHT: CASE MATERIAL: HARDWARE: INGRESS: OPERATING TEMP: STORAGE TEMP: COLORS: |
| BATTERIES | LIFE: |
| CONNECTION | SWITCHES: BATTERY: |
| OUTPUT | ABORT: |
| Battery type | AA |
| Output voltage | 330 |
| Output energy (joules) | 19 |
| Max resistance (ohms) | 220 |
| Rated cap count | 105 |
| Firing cycles per battery | ~150+ |
| Initiation type | Electric |
| Length | 9" |
| Width | 4" |
| Height | 4" |
| Weight | 2lbs |
| Waterproof | Yes |
| MSHA approved | No |
| CE approved | Yes |
| Pack size | Each |
Pick the right machine.
Every shot.
Detailed Specifications
 HB-10 Electric Initiator
|
 HB-55 Electric Blasting Machine
|
 S-355 Compact Electric Blasting Machine
|
 HB-SBS Blasting Machine - Dual Initiation
|
 HB-320 Rugged Waterproof Blasting Machine
|
 S-412 Blasting Machine with Circuit Continuity
|
 HBR-20P Blasting Machine - MSHA Approved
|
 S-2 Non-Electric Blasting Machine
|
 S-3 Powerful Blasting Machine
|
 S-27 Blasting Machine
|
 HR-3 Mechanical Starter
| |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Initiation Type | Electric | Electric | Electric | Dual Initiation | Electric | Electric | Electric | Non-Electric | Dual Initiation | Non-Electric | Mechanical |
| Firing Cycles Per Battery | ~300+ | ~300+ | ~300+ | ~250+ | ~150+ | ~250+ | ~200+ | — | ~250+ | — | — |
| Battery Type | 9V | 9V | 9V | 9V | AA | 9V | AA | — | 9V | — | — |
| Output Volts DC | 150 | 225 | 350 | 450 | 330 | 400 | 350 | 400 x 2 | 400 | 400 | 400 |
| Output Joules | 1.25 | 4 | 5 | 5 | 19 | 12 | 6.125 | 12 x 2 | 12 | 12 | 12 |
| Initiation Resistance (ohms) | 50 | 135 | 230 | 250 | 220 | 240 | N/A | — | 240 | — | — |
| Estimated Single Series Caps | 20 | 62 | 110 | 120 | 105 | 115 | 20 | — | 115 | — | — |
| Waterproof | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | — |
| MSHA Approved | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ |
| Rapid Charging | ✓ | ✓ | ✓ | ✗ | ✓ | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ |
| Detachable Belt Loop | ✓ | ✗ | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ | ✓ | ✗ | ✗ |
| Continuity Indicator | ✗ | ✓ | ✓ | ✗ | ✗ | ✓ | ✗ | ✗ | ✓ | ✗ | ✗ |
| CE Approved | ✓ | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
Swipe to see all columns →
Pick the HB-10 when you are firing small construction shots and want a compact, hand-held electric initiator. 50-ohm capacity, 9V battery, fits on your belt. Roughly 20 caps per single series.
Pick the HB-55 for mid-sized electric shots that need built-in circuit continuity verification. 135 ohm capacity, fires roughly 62 caps in single series.
Pick the S-355 when you need 230-ohm capacity in a compact form factor. Continuity indicator built in, rapid charge, fires roughly 110 caps per single series.
Pick the HB-SBS when crews switch between electric and shock-tube circuits. Auto-detects what is connected. 250-ohm electric capacity, fires roughly 120 caps single series.
Pick the HB-320 for large production circuits and harsh environments. 220-ohm capacity, 19-joule output, AA-battery powered, CE approved. Roughly 105 caps single series.
Pick the S-412 for large electric shots where pre-fire continuity verification is critical. 240-ohm capacity, continuity indicator, fires roughly 115 caps single series.
Pick the HBR-20P for underground coal and gassy metal/non-metal mines. MSHA-approved permissible unit, auto-shunts output 4.5–8 ms after firing. AA battery, roughly 20 caps single series.
Pick the S-2 for shock-tube firing on large surface benches. Two 400-volt outputs, 12 joules each. Immune to stray current and RF energy.
Pick the S-3 when you need a high-energy dual-initiation machine. 12-joule output, 240-ohm capacity, continuity indicator. Fires roughly 115 caps single series.
Pick the S-27 as a robust non-electric shock-tube firing device. 400-volt, 12-joule output. Heavy-duty build for production benches.
Pick the HR-3 when you want a battery-free mechanical starter for shock-tube initiation. No electronics, no batteries, no charging — a reliable backup for any non-electric circuit.
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