DOLD BD5935 – Emergency Stop Safety Relay Module | DOLD SAFEMASTER Series
Engineering Background
Industrial machinery and automated production lines require certified safety circuits that can reliably de-energize hazardous motion within milliseconds of an emergency stop event. The DOLD BD5935 is engineered specifically for this mission-critical role, providing a hardware-based, dual-channel monitoring solution that satisfies the most stringent functional safety standards in force today.
Product Positioning
The BD5935 sits within DOLD’s SAFEMASTER family — a proven platform trusted by OEMs and system integrators across press, robotics, conveyor, and packaging applications worldwide. It is the preferred choice for procurement engineers who need a drop-in, standards-compliant emergency stop relay without custom engineering overhead.
Complete Technical Specifications
| Manufacturer | DOLD & Söhne KG |
| Part Number / SKU | BD5935 |
| Series / Platform | SAFEMASTER |
| Function | Emergency Stop / Safety Door Monitor |
| Supply Voltage | 24 V DC (±15%) |
| Input Channels | Dual-channel (2-channel monitored) |
| Safety Outputs | 3 × NO (force-guided / positively driven) |
| Auxiliary Output | 1 × NC (signalling) |
| Response Time | ≤ 20 ms |
| Recovery Time | ≤ 150 ms |
| Safety Integrity Level | SIL 3 (IEC 62061) |
| Performance Level | PLe / Category 4 (EN ISO 13849-1) |
| Operating Temperature | -10 °C … +55 °C |
| Storage Temperature | -25 °C … +70 °C |
| Degree of Protection | IP40 (housing) / IP20 (terminals) |
| Mounting | DIN rail EN 60715 (35 mm) |
| Housing Width | 22.5 mm |
| Connection Type | Screw terminals |
| Certifications | CE, TÜV, UL, cUL |
| Standards Compliance | EN ISO 13849-1, IEC 62061, EN 60947-5-1 |
| Restart Mode | Automatic / Manual (selectable) |
| Cross-fault Detection | Yes — short-circuit across input channels detected |
| Weight | Approx. 120 g |
Proven Application Environments
- Emergency stop pushbutton circuits on industrial presses and stamping machines
- Safety door / guard interlock monitoring on robotic work cells
- Light curtain and two-hand control interface circuits
- Conveyor and material handling line safety loops
- Packaging machinery with frequent operator access zones
- Crane and hoist control panels requiring SIL 3 / PLe compliance
- Semiconductor and cleanroom equipment with stringent SEMI S2 requirements
Engineering Advantages
- Dual-channel architecture — eliminates single-point-of-failure risk; both channels must open simultaneously for a valid stop signal
- Force-guided relay contacts — mechanically linked NO/NC contacts prevent simultaneous closure, enabling downstream diagnostics
- Cross-fault detection — internal monitoring detects wiring faults between input channels before they mask a genuine stop event
- Selectable restart mode — automatic restart for low-risk zones; manual (monitored) restart for high-risk access areas, all via a single device
- Compact 22.5 mm DIN-rail footprint — maximises panel density without sacrificing safety architecture
- Wide supply voltage tolerance (±15%) — robust against industrial power fluctuations and long cable runs
- TÜV / UL dual certification — accepted by both European CE and North American UL inspection bodies without additional hardware
System Architecture & Signal Flow
The BD5935 operates on a dual-channel, positively-guided relay principle:
- Input Stage — Two independent input channels (A1/A2 and S11/S12) monitor the E-stop contact or safety switch. Both channels must be closed (healthy) for the output relays to energise.
- Logic & Monitoring Core — Internal microprocessor continuously cross-checks channel states and tests for short-circuits between channels. Any discrepancy locks the outputs in the de-energised (safe) state.
- Output Stage — Three force-guided NO contacts (13/14, 23/24, 33/34) switch the machine’s power contactors or drives. One NC auxiliary contact (41/42) provides a feedback signal to the PLC or HMI.
- Restart Circuit — In manual restart mode, a separate normally-open reset pushbutton (S33/S34) must be momentarily pressed after the hazard is cleared, preventing automatic re-energisation.
This architecture satisfies the Category 4 / PLe requirement for a common-cause failure (CCF) resistant design with diagnostic coverage (DC) ≥ 99%.
Sourcing & Quality Verification
- Authorised supply chain — Konmask sources BD5935 units directly from DOLD-authorised distributors and verified OEM surplus channels; no grey-market or counterfeit risk
- Pre-shipment inspection — each unit undergoes visual inspection, label verification (date code, CE/TÜV markings), and functional continuity check before dispatch
- Original packaging — shipped in DOLD factory packaging with datasheet and declaration of conformity where available
- Traceability — batch/lot records retained for 3 years; available on request for regulated industries (medical, aerospace, rail)
Procurement Process
- Confirm quantity & lead time — contact us with your required quantity; in-stock units ship within 1–2 business days
- Request a quotation — email support@konmask.com or call +0086 19859288691 for volume pricing and freight options
- Place order — via this product page (online checkout) or by purchase order (PO) for approved B2B accounts
- Shipping & documentation — commercial invoice, packing list, and certificate of conformity provided with every shipment; DDP/DAP Incoterms available
- After-sales support — technical datasheet, wiring diagrams, and application guidance provided post-purchase at no charge
Technical FAQ
Q: Can the BD5935 monitor a single-channel E-stop button?
A: Yes — it can be wired in single-channel mode, but this reduces the achievable Performance Level to PLc/Category 2. Dual-channel wiring is required for PLe/Cat.4.
Q: What is the maximum cable length between the E-stop button and the BD5935?
A: DOLD recommends keeping input wiring under 100 m to avoid capacitive leakage that could mask a channel fault. For longer runs, use shielded cable and consult DOLD’s application engineering team.
Q: Is the BD5935 compatible with 24 V AC supply?
A: No — the BD5935 is rated for 24 V DC only. For AC supply applications, refer to the DOLD BD5980 series.
Q: Can multiple BD5935 units be cascaded for zone-based safety?
A: Yes — the NC auxiliary output (41/42) of one unit can feed the input of a downstream unit to create a safety chain, provided the overall system PL calculation is re-validated.
Q: Does Konmask provide wiring diagrams?
A: Yes — the official DOLD BD5935 datasheet with wiring diagrams is available upon request. Contact support@konmask.com.
Q: What is the warranty on this product?
A: Konmask provides a 12-month warranty against manufacturing defects from the date of shipment. Warranty claims are processed within 5 business days.
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Contact: support@konmask.com | +0086 19859288691
