Technical Parameters Parameter / Feature Specification / Detail Product / Model BT51T 24DC Safety Relay — 2TLA010033R3000 Supply Voltage (Us) 24 V DC (±15% / –25%) Power Consumption ≈ 1.4 W (typical), up to 1.8 W Safety Outputs 4 × Normally‑Open (4 NO) relay contacts Contact Rating (Resistive Load) 6 A @ 250 V AC / 1500 VA max; 6 A @ 24 V DC / 150 W max Inductive / AC‑15 / DC‑13 Load Capacity AC‑15 (240 V AC): 2 A; DC‑13 (24 V DC): 1 A Maximum Total Switching Capacity (All Contacts) 12 A (distributed across outputs) Minimum Switching Load 10 mA @ 10 V (if load per contact ≤ 100 mA) Contact Material Silver with gold flash (Ag + Au‑flash) Output Delay (Drop / Soft‑Stop) Selectable 0 – 1.5 seconds Input / Reset / Supervision Single‑ or dual‑channel safety inputs; supervised test/reset input for checking contactor/valve drop before restart Mounting / Terminals 35 mm DIN‑rail mounting; screw‑clamp terminals (with detachable/quick‑release connector blocks) Dimensions (W × H × D) 22.5 mm × 84 mm × 120 mm Protection / Housing Rating Housing: IP40; Terminals: IP20 (per IEC 60529) Environmental / Operating Conditions Operating temperature: –10 °C to +55 °C; Pollution degree 2; Impulse withstand voltage 2.5 kV Safety Performance / Standards Safety Category 4, Performance Level e (PL e) per EN ISO 13849‑1; SIL 3 per IEC 62061 when used in compliant safety circuits Status Indication LEDs for supply, relay, and output state Typical Use Cases Emergency‑stop circuits; safety‑switch / interlock monitoring; safety‑gate / hatch guard; safety‑output expansion; delayed safe stop (soft‑stop) control; industrial machine safety.